The heat of reaction for the given equation is -60 kJ/mol.
To determine the heat of reaction for the given equation, we need to calculate the difference between the total heat of formation of the products and the total heat of formation of the reactants. The heat of reaction can be expressed as:
ΔH = Σ(heat of formation of products) - Σ(heat of formation of reactants)
First, let's calculate the heat of formation for the reactants and products:
Reactants:
CH4(g): heat of formation = -75 kJ/mol
Cl2(g): heat of formation = 0 kJ/mol
Products:
CCl4(g): heat of formation = -135 kJ/mol
H2(g): heat of formation = 0 kJ/mol
Now, substitute the values into the equation:
ΔH = (1 × heat of formation of CCl4) + (2 × heat of formation of H2) - (1 × heat of formation of CH4) - (2 × heat of formation of Cl2)
= (1 × -135 kJ/mol) + (2 × 0 kJ/mol) - (1 × -75 kJ/mol) - (2 × 0 kJ/mol)
= -135 kJ/mol + 0 kJ/mol + 75 kJ/mol + 0 kJ/mol
= -60 kJ/mol
Therefore, the heat of reaction is -60 kJ/mol.
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The C-C stretching vibration of ethylene can be treated as a harmonic oscillator.b. putting different substituents on the ethylene can make the c-c bond longer or shorter. for a shorter c-c bond, will the vibrational frequency increase or decrease relative to ethylene? why?
For a shorter C-C bond, the vibrational frequency will increase relative to ethylene.
The C-C stretching vibration in ethylene can be treated as a harmonic oscillator, which follows Hooke's law. Hooke's law states that the force required to compress or extend a spring is proportional to the displacement. In the context of molecular vibrations, this means that the vibrational frequency is proportional to the square root of the force constant (k) divided by the reduced mass (μ). When the C-C bond becomes shorter, the bond strength increases, leading to a higher force constant (k). As a result, the vibrational frequency (ν) increases because ν ∝ √(k/μ).
When the C-C bond in ethylene is shorter due to the presence of different substituents, the vibrational frequency of the bond increases compared to the original ethylene molecule. This occurs due to the increase in bond strength and the resulting higher force constant.
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How did colonialism affect the region's development and set the stage for current conflicts in East Africa?
Colonialism had a profound impact on East Africa, shaping its development and laying the groundwork for ongoing conflicts in the region. The effects of colonial rule can be seen in political, economic, social, and cultural aspects.
Firstly, colonial powers imposed arbitrary borders without considering the ethnic, cultural, and historical realities of the region. This led to the creation of artificial nation-states that encompassed diverse ethnic groups, often resulting in internal tensions and conflicts. The borders created during colonialism continue to be a source of contention and have fueled separatist movements and territorial disputes.
Secondly, colonial powers exploited the region's resources for their own benefit. Natural resources such as minerals, land, and labor were extracted and exported, leading to economic imbalances and underdevelopment in East Africa. This legacy of resource exploitation and economic dependency has contributed to ongoing economic challenges and inequality in the region.
Moreover, colonial powers imposed their own systems of governance, administration, and education, which marginalized local populations and suppressed their cultural practices and identities. These legacies of political and cultural domination have perpetuated divisions and grievances, fueling conflicts along ethnic, religious, and political lines.
Furthermore, the colonial legacy of divide and rule tactics, such as favoring certain ethnic groups or promoting ethnic rivalries, has left a lasting impact on the political landscape of East Africa. Political power struggles, exclusionary policies, and competition over resources have contributed to conflicts and power struggles that persist to this day.
In conclusion, colonialism in East Africa had far-reaching consequences. It disrupted local social structures, exploited resources, created artificial borders, and imposed foreign systems of governance. These factors have shaped the region's development and set the stage for current conflicts by exacerbating ethnic tensions, perpetuating economic inequalities, and fostering political instability. Understanding the historical context of colonialism is crucial for comprehending the complexities of the conflicts and challenges faced by East Africa today.
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A voltaic cell is constructed with two Zn2+-Zn electrodes, where the half-reaction is Zn2+ + 2e− → Zn (s) E° = -0.763 V The concentrations of zinc ion in the two compartments are 4.50 M and 1.11 ⋅ 10^−2 M, respectively. The cell emf is ________ V.A) -1.54 . 10^-3 B) -378 C) 0.160 D) -0.761 E) 0.0798
Therefore, the answer is D) -0.761. The cell emf can be calculated using the Nernst equation:
Ecell = E°cell - (RT/nF) * ln(Q)
Where E°cell is the standard cell potential, R is the gas constant, T is the temperature in Kelvin, n is the number of electrons transferred in the half-reaction, F is the Faraday constant, and Q is the reaction quotient.
In this case, the half-reaction is Zn2+ + 2e− → Zn (s) with E° = -0.763 V. The concentrations of zinc ion in the two compartments are 4.50 M and 1.11 ⋅ 10^−2 M, respectively.
The reaction quotient Q can be calculated using the concentrations:
Q = [Zn2+]2 / [Zn2+]1 = (1.11 ⋅ 10^−2)^2 / 4.50 = 2.72 ⋅ 10^-5
Plugging in all the values in the Nernst equation, we get:
Ecell = -0.763 - (8.3145 * 298 / (2 * 96485)) * ln(2.72 ⋅ 10^-5) = -0.761 V
Therefore, the answer is D) -0.761.
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23) It took 116 hours to produce 603 g of metal X by performing electrolysis on molten XCls with a current of 2.00 A. Calculate the molar mass of X. a) 55.8 g/mol b) 72.6 g/mol c) 27.0 g/mol d) 204 g.mol e) 209 g/mol
To solve this problem, we can use the formula:
moles of X = (current × time) / (96500 × n)
where n is the number of electrons transferred per X ion during electrolysis (we assume it is one).
First, we need to calculate the number of moles of X produced:
moles of X = (2.00 A × 116 hours) / (96500 × 1) = 0.00236 mol
Rounding to the nearest tenth, the molar mass of X is 127.8 g/mol.
Therefore, none of the options provided match the correct answer.
To calculate the molar mass of metal X, we can use the formula:
Molar mass of X = (Mass of X * Faraday constant) / (Charge * Time * Current)
First, we need to find the charge. The number of moles of electrons can be calculated using the formula:
Moles of electrons = (Current * Time) / Faraday constant
With a current of 2.00 A and time of 116 hours (converted to seconds: 116 * 3600 = 417,600 s), we get:
Moles of electrons = (2.00 A * 417,600 s) / (96,485 C/mol) ≈ 8.66 mol
Now, we can find the moles of metal X using the stoichiometry of XCls, which shows that one mole of metal X is produced per mole of electrons:
Moles of X = 8.66 mol
Finally, we can find the molar mass of X by dividing the mass (603 g) by the moles of X:
Molar mass of X = 603 g / 8.66 mol ≈ 69.6 g/mol
The closest answer to our calculated value is (b) 72.6 g/mol.
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or the gas phase decomposition of dichloroethane,
CH3CHCl2CH2=CHCl + HCl
the rate constant in s-1 has been determined at several temperatures. When ln k is plotted against the reciprocal of the Kelvin temperature, the resulting linear plot has a slope of -2.49 104 K and a y-intercept of 27.9.
The value of the rate constant for the gas phase decomposition of dichloroethane at 703 K is_ s-1.
The rate constant for the gas phase decomposition of dichloroethane at 703 K is approximately [tex]0.000551 s^{(-1)}[/tex], as determined using a linear plot of ln k versus the reciprocal of the Kelvin temperature.
Rate constantTo determine the rate constant for the gas phase decomposition of dichloroethane at 703 K, we can use the given information about the linear plot of ln k versus the reciprocal of the Kelvin temperature.
The linear equation relating ln k and the reciprocal of the Kelvin temperature can be written as:
[tex]ln k = (-2.49 \times 10^4 K) \times (1/T) + 27.9[/tex]
Here, T represents the temperature in Kelvin.
To find the rate constant at 703 K, we substitute the temperature value into the equation:
[tex]ln k = (-2.49 \times 10^4 K) \times (1/703 K) + 27.9[/tex]
Calculating this expression will give us the value of ln k at 703 K. We can then determine the rate constant by taking the exponential of ln k:
[tex]k = e^{(ln k)}[/tex]
Let's perform the calculations:
[tex]ln k = (-2.49 \times 10^4 K) \times (1/703 K) + 27.9[/tex]
[tex]ln k = -35.387 + 27.9[/tex]
[tex]ln k = -7.487[/tex]
[tex]k = e^{(-7.487)}[/tex]
[tex]k = 0.000551 s^{(-1)}[/tex]
Therefore, the value of the rate constant for the gas phase decomposition of dichloroethane at 703 K is approximately [tex]0.000551 s^{(-1)}[/tex].
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acetic acid, ch3co2h, is the solute that gives vinegar its characteristic odor and sour taste. true or false
True, acetic acid (CH3CO2H) is the solute that gives vinegar its characteristic odor and sour taste. In a typical vinegar solution, it is present at around 4-8% concentration. But it is essential to note that vinegar's content loaded with acetic acid contributes to its unique properties.
True. Acetic acid, CH3CO2H, is the solute responsible for giving vinegar its characteristic odor and sour taste. Vinegar is a solution that is typically 5-8% acetic acid by volume, with the remainder being water and other trace compounds. The acetic acid is a product of the fermentation of ethanol by acetic acid bacteria, and it is this content-loaded acetic acid that gives vinegar its distinct flavor and aroma. So, in summary, acetic acid is the primary component of vinegar that contributes to its odor and sour taste.
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of the molecules below, the bond in ________ is the most polar. group of answer choices hcl hf hbr h2 hi
Of the molecules below, the bond in HF is the most polar. So the correct answer is option: 2.
Among the given molecules, the bond in HF (hydrogen fluoride) is the most polar. The polarity of a bond is determined by the difference in electronegativity between the two atoms involved. Fluorine (F) is the most electronegative element on the periodic table, while hydrogen (H) has a lower electronegativity. The electronegativity difference between F and H is the highest among the choices. As a result, the bond in HF is highly polar, with the fluorine atom having a partial negative charge (δ-) and the hydrogen atom having a partial positive charge (δ+). Therefore, option 2 is the correct answer.
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--The complete Question is, of the molecules below, the bond in ________ is the most polar.
group of answer choices
1. hcl
2. hf
3. hbr
4. h2 ---
.TRUE OR FALSE: For a given substance, the entropy always increases in the following order: gas -> liquid -> solid.
"For a given substance, the entropy always increases in the following order: gas -> liquid -> solid." This statement is: false.
How does entropy work?The entropy of a substance does not always increase in the order of gas, liquid, and solid. Entropy is a measure of the disorder or randomness in a system. The state with the highest disorder has the highest entropy. In the case of a substance, the entropy can increase or decrease depending on the conditions and phase changes.
For example, the entropy of a substance can increase when it changes from a solid to a liquid or from a liquid to a gas. This is because the molecules in the substance have more freedom of movement and can be arranged in more ways, increasing the disorder of the system. However, if a gas is compressed, the molecules become more ordered, decreasing the entropy.
Overall, the entropy of a substance is dependent on the specific conditions and phase changes that it undergoes. It is not always true that the entropy will increase in the order of gas, liquid, and solid. Hence, the statement is false.
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1.0 liter of he gas at 20oc and 1.013 x 105 n/m2 is compressed isothermally to a volume of 0.1 liter. the work done on the gas is:group of answer choices4.7 x 102 j2.3 x 102 j- 4.7 x 102 j0 jnone of the other answers is correct-2.3 x 102 j
The work done on the gas is 91.17 J, so one of the given answer choices match this value, so the correct answer is "none of the other answers is correct."
To determine the work done on helium gas compressed isothermally, we'll use the formula
W = -PΔV, where W represents work, P is pressure, and ΔV is the change in volume.
In this case, the initial volume is 1.0 L, and the final volume is 0.1 L, resulting in a ΔV of -0.9 L.
The pressure is 1.013 x 10^5 N/m². Since the process is isothermal, the temperature remains constant at 20°C.
Converting the volume change to m³, we get ΔV = -0.0009 m³.
Now, we can calculate the work done:
W = - (1.013 x 10⁵ N/m²) x (-0.0009 m³) = 91.17 J.
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What reaction type is represented by this equation?
[tex]6Li + Cu3(PO4)2 = 2Li3PO4 + 3Cu[/tex]
It represents a double displacement reaction, specifically a precipitation reaction. In a double displacement reaction, the cations and anions of two different compounds switch places to form new compounds.
In this displacement reaction, lithium (Li) cations from lithium (Li) react with the phosphate (PO4) anions from copper(II) phosphate (Cu₃(PO₄)₂), and the copper (Cu) cations from copper(II) phosphate react with the lithium (Li) anions from lithium phosphate (Li₃PO₄). The result is the formation of lithium phosphate (Li₃PO₄) and copper (Cu). Furthermore, this reaction is classified as a precipitation reaction because one of the products /compounds, lithium phosphate (Li₃PO₄), is insoluble and forms a solid precipitate.
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where is the chemical energy stored in adenosine triphosphate (atp), as shown below?
Which of the following have no suggested use in the typical titrimetric experiments conducted so far? Select one: Erlenmeyer flask Mohr pipet Scoopula Micropipet
**The Micropipet** does not have a suggested use in typical titrimetric experiments conducted so far.
In titrimetric experiments, various laboratory tools and equipment are used to measure and transfer precise volumes of solutions. The Erlenmeyer flask is a common vessel used to hold solutions during titrations. The Mohr pipet is employed for accurate delivery of measured volumes of solutions. The Scoopula, on the other hand, is a spatula-like tool used for transferring solid reagents.
However, the **Micropipet** is not commonly used in typical titrimetric experiments. Micropipets are more frequently utilized in analytical techniques such as spectrophotometry or molecular biology experiments, where small volumes in the microliter range need to be dispensed accurately. In titrimetry, the volumes involved are typically larger, making other tools like Mohr pipets or burettes more suitable for the task.
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suppose one mixes 40.0 ml of a 0.25 m solution with 85.0 ml of a 0.12 m solution. assuming volumes are additive, what is the molarity of the final solution?
The molarity of the final solution, obtained by mixing 40.0 ml of a 0.25 M solution with 85.0 ml of a 0.12 M solution, is approximately 0.1616 M.
To find the molarity of the final solution, we can use the equation:
M1V1 + M2V2 = MfVf
where M1 and M2 are the molarities of the initial solutions, V1 and V2 are their respective volumes, Mf is the molarity of the final solution, and Vf is the total volume of the final solution.
In this case, we have:
M1 = 0.25 M (molarity of the first solution)
V1 = 40.0 ml = 0.040 L (volume of the first solution)
M2 = 0.12 M (molarity of the second solution)
V2 = 85.0 ml = 0.085 L (volume of the second solution)
Since the volumes are additive, the total volume of the final solution is:
Vf = V1 + V2 = 0.040 L + 0.085 L = 0.125 L
Substituting the values into the equation, we have:
(0.25 M)(0.040 L) + (0.12 M)(0.085 L) = Mf(0.125 L)
0.010 M + 0.0102 M = Mf(0.125 L)
0.0202 M = Mf(0.125 L)
Dividing both sides of the equation by 0.125 L, we get:
Mf = 0.0202 M / 0.125 L
Mf ≈ 0.1616 M
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how many grams of calcium carbonate, are needed to produce 650ml of carbondioxide gas at stp in the following reaction?
CaCO3(s) + 2 HCl(aq) → CaCl2(aq) + CO2(g) + H2O(l) 2) In a similar experiment. 0.50 g of Mg was completely consumed and hydrogen gas collected at 22 ºC and 742 mm pressure. What would be the volume of the hydrogen gas?
To determine the number of grams of calcium carbonate needed to produce 650 mL of carbon dioxide gas at STP in the given reaction. Therefore, the volume of the hydrogen gas is 64.85 L.
Here we need to use the balanced chemical equation for the reaction and the molar mass of calcium carbonate ([tex]CaCO_3[/tex]) and carbon dioxide gas.
The balanced equation for the reaction is:
([tex]CaCO_3[/tex])(s) + 2HCl(aq) → ([tex]CaCO_3[/tex])(aq) + CO(g) + 2H(l)
Using the molar mass of the substances in the equation, we can calculate the number of moles of each substance that are needed for the reaction to proceed.
The molar mass of calcium carbonate ( ([tex]CaCO_3[/tex])) is 100.09 g/mol. The molar mass of carbon dioxide gas is 44.01 g/mol.
To calculate the number of grams of calcium carbonate needed, we can multiply the number of moles by the molar mass of the substance:
0.002997 mol ([tex]CaCO_3[/tex]) * 100.09 g/mol ([tex]CaCO_3[/tex]) = 0.002997 g ([tex]CaCO_3[/tex])
Therefore, we need 0.002997 grams of calcium carbonate to produce 650 mL of carbon dioxide gas at STP in the given reaction.
To find the volume of the carbon dioxide gas, we can use the ideal gas law:
PV = nRT
In this case, we have:
P = 22 + 742 = 764 kPa
T = 22 + 273.15 = 295.15 K
n = 0.002997 mol = 7.64 x [tex]10^{-3[/tex] mol
R = 8.314 J/(mol·K)
7.64 x [tex]10^{-3[/tex] mol * (295.15 K / 273.15 K) * (764 kPa / (0.000198979 atm))
= 64.85 L
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A first order reaction, where [A]o = 1.00 M, is 66.1 % complete in 335 s. How long does it take for the same reaction to go from 1.00 M to 85.7 % completion?
The reaction takes 0.335 s to go from 1.00 M to 85.7 % completion. The rate of a first-order reaction can be calculated using the equation:
rate = k[A]
where k is the rate constant and [A] is the concentration of the substrate.
The percentage of completion of a reaction can be calculated using the equation:
% completion = 1 - [(1 - [A])/([A]o)]
where [A] is the current concentration of the substrate and [A]o is the initial concentration of the substrate.
Using the given values of [A]o = 1.00 M and [A] = 0.661 M, we can find the rate constant using the equation:
rate = k[A]
k = -r[A]o
where r is the rate constant.
We can also use the equation for the percentage of completion to find the time it takes for the reaction to go from 1.00 M to 85.7 % completion:
% completion = 1 - [(1 - [A])/([A]o)]
85.7 % completion = 1 - [(1 - 0.661)/(1.00)]
85.7 % completion = 0.339
Therefore, the time it takes for the reaction to go from 1.00 M to 85.7 % completion can be calculated using the equation:
time = -r[A]o
time = -r(1.00)
time = 0.335 s
Therefore, the reaction takes 0.335 s to go from 1.00 M to 85.7 % completion.
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A researcher is using 4.21 x 1023 molecules of chlorine gas (Cl2) in an experiment. How many grams of chlorine is the researcher using? Remember to include units (abbreviated appropriately) and the substance in your answer. Round your answer to the nearest 0.01.
The amount of chlorine gas released throughout the experiment weighs 49.70 g.
How many moles are there in total?A mole (mol) is the amount of a substance that has exactly as many particles as there are atoms in 12 grams of carbon-12.
The number of moles is obtained by dividing the specified mass of a substance by its molar mass. The weight of one mole of a substance is its molar mass, which is expressed in grams per mole.
Having said that,
The number of molecules in 1 mole of chlorine gas would be 6.02 * 1023.
Chlorine gas would contain 4.21 * 1023 molecules per mole.
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draw a complete structure for a molecule with the molecular formula ccl2o.
The molecule with the molecular formula CCl2O is called dichloromethanal, also known as formaldehyde chloride. Its complete structure can be represented as follows:
Cl
|
H - C - Cl
In this structure, the central carbon atom (C) is bonded to two chlorine atoms (Cl) and one hydrogen atom (H). The chlorine atoms are attached to the carbon atom on either side, and the hydrogen atom is attached to the carbon atom at the opposite end. The structure indicates that the carbon atom is double-bonded to the oxygen atom (O), which completes the molecular formula CCl2O.
The molecular formula CCl2O does not correspond to a stable molecule. However, if you intended to ask for a structure with the molecular formula CCl2O2, which is dichlorine dioxide, the structure can be represented as follows:
Cl
|
O = C = O
|
Cl
In this structure, the central carbon atom (C) is double-bonded to both oxygen atoms (O). Each chlorine atom (Cl) is attached to the carbon atom on either side. This arrangement satisfies the molecular formula CCl2O2.
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A feedstock of pure n-butane is cracked at 750 K and 1.2 bar to produce olefins. The reactions are: C_4H_10 rightarrow C_2H_4 + C_2H_6^(I) C_4H_10 rightarrow C_3H_10 rightarrow C_3H_6 + CH_4 (II) The equilibrium constants are, K_1 = 3.856 and K_II = 268.4. At equilibrium, what is the product composition?
In order to determine the product composition at equilibrium, we can use the equilibrium constants and the stoichiometry of the reactions. First, we need to calculate the mole fractions of each component in the equilibrium mixture. Let x be the mole fraction of n-butane, y be the mole fraction of ethylene, z be the mole fraction of propane, w be the mole fraction of propylene, and u be the mole fraction of methane.
Using the equilibrium constants, we can write the following equations:
K_1 = (y*w)/(x)
K_II = (z*w)/(x*y)
Substituting the expressions for y and w from the first equation into the second equation and solving for z, we get:
z = (K_II*x)/(K_1*w)
Now we can solve for the mole fractions:
x = 1 (since the feedstock is pure n-butane)
y = K_1*w/x = K_1/(K_1 + K_II)
w = y/(K_1/K_II + 1)
z = K_II*x*w/K_1 = K_II/(K_1 + K_II)
Finally, we can substitute the values of K_1 and K_II to obtain:
y = 0.0126
w = 0.0117
z = 0.987
Therefore, the product composition at equilibrium is approximately 1.26% ethylene, 1.17% propylene, and 98.7% propane.
(Note: This answer is longer than 100 words, but I wanted to show the steps in the calculation for clarity.)
At 750 K and 1.2 bar, pure n-butane (C4H10) undergoes two cracking reactions to produce olefins. The reactions are as follows:
(I) C4H10 → C2H4 + C2H6, with an equilibrium constant K1 = 3.856
(II) C4H10 → C3H6 + CH4, with an equilibrium constant K2 = 268.4
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At a certain temperature the rate of this reaction is second order in NH4OH with a rate constant of 34.1M^-1s^-1.
NH4OH(ag) → NH3(ag) + H2O (Ag)
Suppose a vessel contains NH4OH at a concentration of 0.100 M. calculate how long it takes for the concentration of NH4OH to decrease to 0.0240 M. you may assume no other reaction is important. round your answer to significant digits.
The time it takes for the concentration of NH4OH to decrease from 0.100 M to 0.0240 M is approximately 41.3 seconds.
The rate equation for the given reaction is second order, which can be expressed as rate = k[NH4OH]^2, where k is the rate constant. We can use the integrated rate law for a second-order reaction to solve for time:
[tex]1/[NH4OH]t - 1/[NH4OH]0 = kt[/tex]
Where [NH4OH]t is the final concentration (0.0240 M), [NH4OH]0 is the initial concentration (0.100 M), and k is the rate constant (34.1 M^-1s^-1). Rearranging the equation and plugging in the values:
[tex]1/0.0240 - 1/0.100 = (34.1)(t)[/tex]
Simplifying the equation:
[tex]41.7 s ≈ t[/tex]
Therefore, it takes approximately 41.3 seconds for the concentration of NH4OH to decrease from 0.100 M to 0.0240 M.
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What is the boiling point elevation of a solution that is 800 g ethylene glycol (mw = 62.01 g/mole) in 3.5 kg of water? kb (h2o) = 0.52 °c/m.a) 2.92 °C b) 3.42 °C c) 4.32 °C d) 4.92 °C
Boiling point elevation is a colligative property, which means it depends on the number of solute particles in a solution, not the identity of the solute itself. The formula for boiling point elevation is:
ΔTb = Kbm
Where ΔTb is the change in boiling point, Kb is the molal boiling point elevation constant (0.52°C/m for water), and m is the molality of the solution, which is the number of moles of solute per kilogram of solvent. To calculate the molality, we need to first calculate the number of moles of ethylene glycol in the solution:
moles of ethylene glycol = mass of ethylene glycol / molecular weight of ethylene glycol
moles of ethylene glycol = 800 g / 62.01 g/mol
moles of ethylene glycol = 12.903 mol
Next, we need to calculate the mass of water in the solution:
mass of water = 3.5 kg - 0.8 kg
mass of water = 2.7 kg
Finally, we can calculate the molality:
molality = moles of solute / mass of solvent (in kg)
molality = 12.903 mol / 2.7 kg
molality = 4.78 mol/kg
Now we can plug in the values into the boiling point elevation formula:
ΔTb = Kbm
ΔTb = 0.52°C/m × 4.78 mol/kg
ΔTb = 2.49°C
The boiling point of pure water is 100°C, so the boiling point of the solution is:
boiling point = 100°C + ΔTb
boiling point = 100°C + 2.49°C
boiling point = 102.49°C
Therefore, the correct answer is (a) 2.92°C.
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why do you suppose triphenylphosphine is used to prepare wittig reagents rather then, say, trimethylphosphine
Triphenylphosphine is commonly used to prepare Wittig reagents due to its stability and reactivity towards aldehydes and ketones.
Wittig reaction involves the formation of a phosphorus ylide, which can then react with a carbonyl compound to give an alkene product. The ylide is formed by treating a phosphonium salt with a strong base. Triphenylphosphine is a more stable phosphine compared to trimethylphosphine, which means it can form a more stable phosphonium salt. Additionally, the triphenylphosphine ylide is more reactive towards carbonyl compounds, leading to higher yields of the desired alkene product.
In summary, triphenylphosphine is preferred over trimethylphosphine for the preparation of Wittig reagents due to its stability and reactivity towards carbonyl compounds.
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An equal number of moles of neon and a second gas diffuse into a chamber with no change in pressure or temperature. Which of the following is a possible molecular formula for the second gas if its diffusion rate is 55.2% lower than that of neon-20? (Molar Mass of Br = 80. F=19, Si = 28 (a) C₂H&S (b) HBrO (c) SiF4 (d) NO₂ (e) HCI An equal number of moles of oxygen and hydrogen 900 diffuse in
To determine the possible molecular formula for the second gas, we need to compare its diffusion rate with neon-20 and consider the given options.
The diffusion rate of the second gas is 55.2% lower than that of neon-20, we can calculate the remaining diffusion rate as 100% - 55.2% = 44.8%.
Let's analyze the options:
(a) C₂H&S: This molecular formula is not a valid option as it does not match any of the given elements.
(b) HBrO: This molecular formula does not match the remaining diffusion rate of 44.8%. Additionally, it does not contain neon as one of its elements.
(c) SiF4: This molecular formula does not match the remaining diffusion rate of 44.8%. Additionally, it does not contain neon as one of its elements.
(d) NO₂: This molecular formula does not match the remaining diffusion rate of 44.8%. Additionally, it does not contain neon as one of its elements.
(e) HCI: This molecular formula matches the remaining diffusion rate of 44.8%. Additionally, it contains neon as one of its elements.
Based on the given options, the possible molecular formula for the second gas is (e) HCI.
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solid,liquid, and gas, are the three states of matter. Which statement describes the common properties of liquid?
Answer:liquid b
Explanation:
i took the test
How many of the following molecules have sp3. ... sp3 hybridization on the central atom? XeCl4 CH4 SF4 CH2H2 A) 0 B) 4 C) 3 D) 2 E) 1.
The correct answer is option E) 1, which refers to CH4. It is the only molecule in the list that has a central atom with sp3 hybridization.
To determine which molecules have sp3 hybridization on the central atom, we need to first identify the central atom in each molecule and then determine its hybridization.
XeCl4 has a central Xe atom that has sp3d2 hybridization, not sp3. Therefore, option A) 0 is correct.
CH4 has a central C atom that has sp3 hybridization, which means it has four hybrid orbitals. Therefore, option B) 4 is incorrect.
SF4 has a central S atom that has sp3d hybridization, which means it has four hybrid orbitals. Therefore, option C) 3 is incorrect.
CH2H2 has two central C atoms, both of which have sp hybridization, which means they have two hybrid orbitals each. Therefore, option D) 2 is incorrect.
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how many ml of 14.5 m nh3 are needed to prepare 2.00 l of a 1.00 m solution?
To prepare 2.00 L of a 1.00 M NH3 solution, you need 137.93 mL of 14.5 M NH3.
To find the volume of the concentrated solution needed, use the dilution formula: M1V1 = M2V2, where M1 and V1 are the molarity and volume of the concentrated solution, and M2 and V2 are the molarity and volume of the diluted solution.
Plug in the given values into the formula:
(14.5 M)(V1) = (1.00 M)(2.00 L)
Solve for V1:
V1 = (1.00 M * 2.00 L) / 14.5 M
V1 = 0.13793 L
Convert to milliliters:
137.93 mL of 14.5 M NH3 is needed to prepare 2.00 L of a 1.00 M solution.
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at a temeprature of -10 degreesc ,no2 molecules combined to form
At a temperature of -10 degrees Celsius (-10 °C), NO₂ molecules can combine to form dinitrogen tetroxide (N₂O₄). At a temperature of -10 degrees Celsius, NO₂ molecules can undergo a reaction known as dimerization.
Dimerization is the process by which two molecules combine to form a larger molecule. In the case of NO₂, the reaction can be represented as:
2NO₂(g) ⇌ N₂O₄(g)
At higher temperatures, NO₂ exists as a brownish-red gas, while at lower temperatures, such as -10 degrees Celsius, it undergoes dimerization to form N₂O₄, which is a colorless gas. The reaction is reversible, meaning that N₂O₄ can also dissociate into NO₂ molecules under appropriate conditions.
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the value of delta h for the reaction below is -1107 j 2ba o2-> 2bao
1107 kJ of heat released when 34.03 g of Ba (s) reacts completely with oxygen to form BaO.
Why is heat released during a reaction?
Heat is released because the reaction is exothermic. An exothermic reaction is a chemical reaction that releases energy in the form of heat. It occurs when the products have lower potential energy than the reactants.
Molar mass of Ba = 137.33 g/mol
Number of moles of Ba = mass / molar mass
= 34.03 g / 137.33 g/mol
≈ 0.2480 mol
According to the balanced equation, the stoichiometric ratio between Ba and BaO is 2:2.
Since the reaction is balanced in terms of moles, we can directly use the stoichiometry to determine the amount of heat released:
Heat released = ΔH° * (moles of BaO formed / stoichiometric coefficient of BaO)
Heat released = -1107 kJ * (2 moles / 2)
= -1107 kJ
Therefore, when 34.03 g of Ba (s) reacts completely with oxygen to form BaO, approximately 1107 kJ of heat is released.
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Complete Question:
The value of ΔH° for the reaction below is -1107 kJ:
2Ba (s) + O2 (g) → 2BaO (s)
How many kJ of heat are released when 34.03 g of Ba (s) reacts completely with oxygen to form BaO?
Select the type of bonding you would expect to find in each of the following substances.
a. Cr(s)
b. H2S(g)
c. CaO(s)
Answer:
a) metallic bonds because Cr(s) is a solid metal
b) H2S(g) is a covalent compound so it would have covalent bonding
c) CaO(s) is an ionic compound so it would have ionic bonding
how does the number od main energy levels in an atom generally affect how tightly its valence electrons are held by the nucleus
The number of main energy levels in an atom generally affects how tightly its valence electrons are held by the nucleus.
The number of main energy levels in an atom is determined by the number of protons in its nucleus. The greater the number of protons, the harder it is for electrons to reach the outermost energy level, or valence shell. The valence shell is the furthest distance from the nucleus, and therefore electrons in this shell are held relatively loosely.
As the number of protons in the nucleus increases, the number of energy levels increases and the valence electrons become increasingly tightly bound, making it harder for them to move. As a result, the valence electrons become more stable and less reactive.
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what is the new volume of a 3.0 L sample of nitrogen gas that is heated from 75°C to 150°C?A) 5.0 L B)1.9 L C) 2.5 L D) 3.6 L
Charles' Law can be used to answer this question, which states that at a constant pressure, the volume of a gas is directly proportional to its temperature in Kelvin.
To use this law, we need to convert the temperatures from Celsius to Kelvin by adding 273.15. The initial temperature is 75°C + 273.15 = 348.15 K, and the final temperature is 150°C + 273.15 = 423.15 K. Next, we can set up a proportion using the initial and final temperatures and volumes: (V1/T1) = (V2/T2) Substituting the given values, we get:(3.0 L/348.15 K) = (V2/423.15 K) Solving for V2, we get: V2 = (3.0 L/348.15 K) x 423.15 K = 3.6 L
Therefore, the new volume of the nitrogen gas is 3.6 L when heated from 75°C to 150°C.
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