CaCl₂ has lowest freezing point as it has higher "im" value.
What is freezing point?A solution's freezing point is lower than that of the pure solvent's. It follows that freezing cannot happen until a solution is lowered to a temperature lower than the pure solvent.
As we know more "im" value lowest is the freezing point.
Here,
m = molarity
i = van't Hoff factor = 1 + (n-1) α
α = degree of ionization
n = number of ions.
A. 0.25 MOL /LITER SUCROSE = 0.25 M SUCROSE
m = 0.25 M
Sucrose is non-electrolyte, so α = 0
or, i = 1 + (n-1) × 0
or, i = 1
So, im = 1 × 0.25 M
im = 0.25 M
B. 0.15 MOL/L CaCl₂ = 0.15 M CaCl₂
m = 0.15 M
CaCl₂ → Ca⁺² + 2Cl⁻
no. of ions (n) = 3
CaCl₂ is electrolyte, so α = 1
Thus, i = 1 + (3-1) × 1
or, i = 3
So, im = 3 × 0.15 M
or, im = 0.45 M
C. 0.15 MOL/L NaCl = 0.15 M NaCl
m = 0.15 M
NaCl → Na⁺ + Cl⁻
no. of ions = 2
NaCl is electrolyte, so α = 1
Thus, i = 1 + (2-1) × 1
or, i = 2
So, im = 2 × 0.15 M
or, im = 0.30 M
D. 0.2 MOL/L NaNO₃ = 0.2 M NaNO₃
m = 0.2 M
NaNO₃ → Na⁺ + NO₃⁻
no. of ions = 2
NaNO₃ is electrolyte, so α = 1
Thus, i = 1 + (2-1) × 1
or, i = 2
So, im = 2 × 0.2 M
or, im = 0.40 M
Among these four aqueous solution, CaCl₂ has higher "im" value thus it has lowest freezing point.
Correct option: B
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When Wavelength is 4.75 x 10-9 what is the frequency of the wave?
3.14 x10-25
1.58 x 10-17
O6.74 x 10 16
The frequency of the given wave is equal to 6.32 × 10¹⁶ Hz.
What are frequency and wavelength?The frequency of the wave can be defined as the number of cycles of a wave in one second. The S.I. units of frequency are per second (s⁻¹) or Hertz.
The wavelength can be defined as the distance between the two crests or troughs in phase with respect to each other.
The expression between wavelength, speed of light, and frequency (ν) is:
c = νλ
Given, the wavelength of the wave, ν = 4.75 ×10⁻⁹ m
The speed of light, [tex]c = 3 \times 10^8 m/s[/tex]
The frequency of the waves can be calculated from the above-mentioned relationship:
ν = c/λ = 3 × 10⁸/4.75 ×10⁻⁹ = 0.632 × 10¹⁷ = 6.32 × 10¹⁶
Therefore, the frequency of the wave is equal to 6.32 × 10¹⁶ Hz.
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According to the following balanced reaction, how many moles of NO are formed from 2.50 moles of NO2 if there is plenty of water present? 3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g)
Answer:
0.83 moles
Explanation:
To find the number of moles of NO that are formed from 2.50 moles of NO2 in the presence of plenty of water, we can use the mole ratio from the balanced chemical equation. The mole ratio is the ratio of the number of moles of each reactant and product in the chemical reaction.
In the given reaction, the mole ratio of NO2 to NO is 3:1. This means that for every 3 moles of NO2, 1 mole of NO is formed. Therefore, if we have 2.50 moles of NO2, the number of moles of NO that are formed will be 1/3 of that amount, which is 2.50 moles / 3 = 0.83 moles.
Therefore, the number of moles of NO that are formed from 2.50 moles of NO2 in the presence of plenty of water is 0.83 moles.
explain in detail, what the theoretical angle of the h-c-o bond angle in h2co is and explain the chemistry behind why the actual h-c-o bond angle in h2co is 122o . [3-points]
The every atom in H₂CO molecule has bond angle is 120 °. the bond angle HCH is 116 ° and The bond angle of H₂CO is 122°.
The H₂CO has trigonal planar molecular geometry. the H₂CO has the same electron geometry that is trigonal planar. The every atom atom attached to the central atom has bond angle is 120 °. the central atom is surrounded by three regions of the electron density. according to the VSEPR theory the molecular geometry is trigonal planar. The H₂CO is the polar molecular. the hybridization is sp².
Thus, the bond angle in H₂CO is 120 ° and the molecular geometry is trigonal planar.
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Which of the following steps can be used to identify a double replacement reaction?
Check whether the products are salt and water.
Check whether the reactants are an acid and a base.
Check if the ions of two compounds exchange places.
Check if one element replaces another element in a compound.
Answer:
C. Check if the ions of two compounds exchange places.
Draw the Lewis structure for the disulfur monoxide (S2O)molecule. Be sure to include all resonance structures that satisfy the octet rule.
Three resonant structures can be seen in the S2O Lewis structure. Within the molecule, double bonds may form as a result of the transfer of electron pairs from the outer sulfur and oxygen atoms. As a result, the stable S2O Lewis structure with no formal charges is formed.
Which of the following cases falls under the octet rule exception?The Octate rule does have three common exceptions, though: molecules with an odd number of electrons, such as NO; molecules like SF6 in which one or more atoms have more than eight electrons; molecules with one or more atoms that have fewer than eight electrons, such as BCl3.
What exactly is CO's Lewis structure?Carbon monoxide's Lewis-dot structure is as follows:
C≡O:
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Which of the following statements correctly describe van der Waals radii? Select all that apply. Check all that apply. A) The van der Waals radius is half the distance between two covalently bonded nuclei. B) In general, van der Waals radii increase from left to right across a period.C) The van der Waals radius for a given atom is always larger than its covalent radius. In general, van der Waals radii increase down a group in the periodic table. D) The van der Waals distance and radius are important for determining how closely any two molecules can approach each other.
The options B, C and D, are the statements that correctly describe van der Waals radii.
Van der Waals radii:Van der Waals radii are an important concept in chemistry, as they provide insight into how atoms interact with one another. Put simply, van der Waals radii are the distance between two covalently bonded nuclei. These radii are used to determine how close any two molecules can approach each other, and this information is essential for understanding how atoms in a molecule interact and behave.
In general, van der Waals radii increase from left to right across a period in the periodic table. This means that atoms located on the left-hand side of the table have smaller radii than those located on the right-hand side. This is due to the fact that the number of electrons in each atom increases as you move across the period.
Additionally, the van der Waals radius for a given atom is always larger than its covalent radius. This is because the van der Waals radius takes into account the non-bonded interactions between atoms, which can be attractive or repulsive.
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What volume of a 2.5 M NaCl solution must be diluted with water to produce 200. mL of a 0.10 M solution?
Answer:one mole of NaCl weighs 58.44 g. A 2.5 M solution is 2.5 moles per liter (Molarity is just the number of moles per liter). Therefore, 0.5 L would contain 1.25 mol. Hence, you would need 1.25 × 58.44 g = 73 g.
Explanation:The formula for calculating a dilution is (C1) (V1) = (C2) (V2) where...
C1 is the concentration of the starting solution.
V1 is the volume of the starting solution.
C2 is the concentration of the final solution.
V2 is the volume of the final solution.
EXPERIMENT 1: List the measured potential for Cell 3: Zn|Zn(NO3)2 || Pb(NO3)2|Pb. Based on your observations, do you expect given electrochemical cell to be spontaneous or nonspontaneous? Explain your answer. Pb|Pb(NO3)2||Zn|Zn(NO3)2
EXPERIMENT 1: What would happen to the measured cell potentials if 30 mL solution was used in each half-cell instead of 25 mL?
EXPERIMENT 1: Calculate the theoretical standard cell potential for the electrochemical cell that includes the reaction. Mn+Pb2+⟶Mn2++Pb The standard reduction potentials for each half reaction are given Mn2++2e−⟶Mn -1.18 V Pb2++2e−⟶Pb -0.13 V How does your calculated value compare to your measured cell potential for Cell 6?
The measured cell potential would be decreased to 0.01% if the salts are the conducting and spontaneous with a standard potential 0.59eV.
The potential difference between two half cells in an electrochemical cell is measured as the cell potential, or Ecell. The electrons ability to move from one half cell to the other is what causes the potential difference.
Due to the fact that the chemical reaction is a redox reaction, electrons can move between the electrodes. When one substance is reduced while another is oxidized, a redox reaction takes place.
As a result of losing one or more electrons during oxidation, the substance gains a positive charge. On the other hand, the substance picks up electrons during reduction and becomes negatively charged.
Cell potential = E-e
=2.18-4.19=-1.01eV
The difference between the potential for the reducing agent to become oxidized and the potential for the oxidizing agent to become reduced will determine the cell potential, which is relevant to the measurement of the cell potential.
A specific value can be assigned to the cell potential because the cell potential (Ecell) is measured in voltage (V).
Standard reduction potential =Ecell/2
=1.18/2=0.59eV
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I need help asap please
Answer:
Explanation: Use the ideal gas law formula
PV = nRT
P = pressure (atm)
V = volume (L)
n = moles
R = universe gas constant (.0821)
T = temperature (K)
-- the given temperature is in Celcius to convert it to Kelvin you add 273 to it
plug in the numbers and solve for n
In a single displacement reaction between Al2S3 and Li, what products will form and why?
A
Li₂S3 and Al because metals replace metals
B
Li3Al and S because metals replace nonmetals
C Li2Al3 and S because metals replace nonmetals
D Li₂S and Al because metals replace metals
Answer: D
Explanation: Cause im always right
The product of the single displacement reaction between Al₂S₃ and Li are Li₂S₃ and Al because metals replaces metals.
What is displacement reaction?Displacement reactions are those, in which one or two species are displaced from a reactant by the reagent. There are two types of displacement reactions namely single displacement and double displacement.
In single displacement reactions, one atom or group from a reactant is replaced by other group. In double displacement, two group of different reactants are exchanged each other.
The reaction between Al₂S₃ and Li is written below:
[tex]\rm Li + Al_{2}S_{3} \rightarrow Li_{2}S_{3} + 2 Al[/tex]
Here, metal Li replaces metal Al. Thus, option A is correct.
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How many grams of solute are present in 705 mL of 0.470MKBr ?
mass of solute: ___
Taking into account the definition of molarity, the mass of solute present in 705 mL of 0.470M KBr is 39.43 grams.
Definition of molarityMolarity is a measure of the concentration of a solute in a solution expressed in the number of moles dissolved per liter of solution. This is, the molarity indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by:
molarity= number of moles÷ volume
Molarity is expressed in units moles/L.
Mass of solute in this caseIn this case, you know:
molarity= 0.470 Mnumber of moles= ?volume= 705 mL= 0.705 L (being 1000 mL= 1 L)Replacing in the definition of molarity:
0.470 M= number of moles÷ 0.705 L
Solving:
0.470 M× 0.705 L= number of moles
0.33135 moles= number of moles
Being the molar mass of KBr 119 g/mole, the mass of the compound can be calculated as:
mass= molar mass× number of moles
mass= 119 g/mole× 0.33135 moles
mass= 39.43 grams
Finally, the mass of solute is 39.43 grams.
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When excess water is added to a mixture of citric acid and sodium bicarbonate present in a bath bomb, the following reaction takes place C₆H₈O₇(s) + 3 NaHCO₃(s) + H₂O(l) → Na₃C₆H₅O₇(aq) + 4 H₂O(l) + 3 CO₂(g) Calculate the volume of CO₂ gas collected over water at 38.0 °C when a mixture of 55.5 g of citric acid and excess sodium bicarbonate is added to a tub of water if the total pressure is 725 torr. The vapor pressure of water at 38.0 °C is 49.7 torr
The volume of the CO₂ collected over water at 38.0 °C when a mixture of 55.5 g of citric acid and excess sodium bicarbonate is added to a tub of water is 24.9 L
How do I determine the volume of CO₂ collected?First, we shall determine the number of mole of CO₂ obtained from the reaction. Details below:
C₆H₈O₇(s) + 3 NaHCO₃(s) + H₂O(l) → Na₃C₆H₅O₇(aq) + 4 H₂O(l) + 3 CO₂(g)
Molar mass of C₆H₈O₇ = 192 g/molMass of C₆H₈O₇ = 55.5 gMole of C₆H₈O₇ = mass / molar mass = 55.5 / 192 = 0.289 mole Mole of CO₂ = ?From the balanced equation above,
1 mole C₆H₈O₇ reacted to produce 3 mole of CO₂.
Therefore,
0.289 mole CaCO₃ will react to produce = 0.289 × 3 = 0.867 mole of CO₂.
Finally, we shall determine the volume of the CO₂ produced. This is illustrated below:
Number of mole (n) = 0.867 moles Pressure (P) = 725 - 49.7 = 675.3 torr = 675.3 / 760 = 0.889 atmTemperature (T) = 38 °C = 38 + 273 = 311 KGas constant (R) = 0.0821 atm.L/Kmol Volume of CO₂ (V) =?PV = nRT
Divide both sides by P
V = nRT / P
V = (0.867 × 0.0821 × 311) / 0.889
V = 24.9 L
Thus, the volume of CO₂ obtained is 24.9 L
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Would a energy-capturing knee brace be a good system for a rescue team? Why or why not?
Yes, most definitely.
Explanation:What is an energy-capturing knee brace?These regenerative brakes collect kinetic energy that normally dissipate as heat when the car slows down. The knee device collects energy lost when a person brakes the knee after swinging the leg forward to take a step, the researchers said.
I hope my answer helped you! If you need more information or help, comment down below and I will be sure to respond if I am online. Have a wonderful rest of your day!
Which of the following would result in a lower equilibrium price for milk? Assume that milk is a normal good. (choose all that apply)
An excess demand will emerge if a minimum price is set below the equilibrium price. In the IPAD market, assuming everything else stays the same.
What are the primary variables influencing milk prices?Federal milk marketing orders, interactions with the federal dairy price assistance program, and wholesale commodity prices for cheese, butter, nonfat dry milk, and dry whey all play a significant role in determining milk pricing at the farm level.
What transpires if milk is a common product and consumer income falls? What happens to the supply or demand for milk?Demand for everyday items like milk declines as consumer incomes fall. A lower milk price will result in an increase in the supply of all goods containing milk as an ingredient.
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Please Help!
How many atoms of sulfur are in a 2.500 mole sample of pure sulfur? *
O 1.505 x 10 24
O 5.69 x 10-24
O 110.
O 1.20 x 1024
Sulfur is a chemical element with the atomic number 16 and the symbol S.
Explain about the Sulfur?The nonmetallic chemical element sulfur (S), also spelled sulfur, is one of the most reactive elements and is a member of the oxygen group (Group 16 of the periodic table). A pale yellow solid with no flavour or odour, pure sulphur is also insoluble in water and has poor electrical conductivity. It is also brittle and tasteless.
The elements sulphur and metal sulphide ores are both found naturally. Near hot springs and volcanoes is where it can be found in its natural state. The tenth most prevalent element, sulfur, is present in nearly all plant and animal life, meteorites, the ocean, the earth's crust, and the atmosphere.
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below are three situations that can affect the transcription of the lac operon. study each situation carefully, then select what is expected to be occurring in terms of (1) glucose concentration, (2) lactose concentration, and (3) transcription level.
Transcription is said to be synthesis of RNA from DNA. Genetic information flows in the direction from DNA to proteins, the substances that give organisms shape. This information flow occurs through a cascade of processes of transcription (DNA to RNA) and translation (RNA to protein). Transcription occurs when a particular gene product is needed at a particular time or in a particular tissue.
Normally only his one strand of DNA is copied during transcription. This is called the template strand, and the resulting RNA molecule is a single-stranded messenger RNA (mRNA). In eukaryotes (organisms with cell nuclei), the first transcript is called pre-mRNA. Pre-mRNAs are extensively edited by splicing before mature mRNAs are generated and ready for translation by ribosomes, organelles that serve as sites for protein synthesis. Transcription of any gene occurs at that gene's chromosomal location, which is a relatively short segment of the chromosome. Active transcription of a gene depends on the need for activity of that particular gene in a particular cell or tissue or at a particular time.
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The complete question is as follows:
Below is shown the lac operon in a single possible situation. Study the figure carefully, then select what is expected to be occurring in terms of
(a) glucose concentration
(b) lactose concentration during this situation.
CAP + cAMP and inducer-repressor complex below operon
(c) transcription level
CAP site empty and inducer-repressor complex below operon
Which formula represents a polar molecule?
C12
N2
CC14
HCI
Answer:
H-Cl reperesents polar bond.
Explanation:
Because H and Cl atoms have diffrent dipole moment so they cannot cancel out each other.
how does brianne feel when she sees the wreckage in far rockaway
Brianne feels shocked and sad when she sees the wreckage in far rockaway.
What is Feeling?This is referred to as a subjective point of view which is used to depict specific sensations based on different factors and circumstances. Examples of feelings include shock, excitement etc which denotes the state of mind of the individual.
In the incidence of a hurricane, she paid attention to the extent of the damaged situation. She watched the news and was in total shock as it narrated the destruction of places she loved and went to for various reasons which is therefore how she felts when she saw the wreckage.
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1. a set of p orbitals can accommodate a maximum of 6 electrons. 2. there are 10 d orbitals in a set. 3. none of the p orbitals are spherically symmetric. 4. the fifth shell with n
1. True – A set of p orbitals can accommodate a maximum of 6 electrons because each p orbital can contain 2 electrons with opposite spins.
2. False – There are only 5 d orbitals in a set, not 10. The d orbitals are divided into five distinct shapes: dz2, dx2-y2, dxz, dyz, and dxy.
3. True – None of the p orbitals are spherically symmetric because they have an elongated shape. This is due to the fact that they have an angular momentum of 1, whereas s orbitals have an angular momentum of 0.
4. True – The fifth shell (or major energy level) has one set of f orbitals which can accommodate a maximum of 14 electrons. The f orbitals are divided into seven distinct shapes: fz3, fxz2, fyz2, fx(x2-3y2), fy(3x2-y2), fxyz, and fx(x2-y2).
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Complete question:
1. a set of p orbitals can accommodate a maximum of 6 electrons.
2. there are 10 d orbitals in a set.
3. none of the p orbitals are spherically symmetric.
4. The fifth shell (or major energy level) has one set of f orbitals.
mark each statement as True or false
Please Help!
What is the molar mass of phenol (C₂H5OH)? The atomic masses of C, H and O
are 12.0, 1.01 and 16.00 amu respectively.
O 94.1 g/mole
O 29.0 g/mole
O 46.0 g/mole
O 100 g/mole
Phenol has a molecular weight of 94.11. The chemical name for phenol is C6H5OH, and it is an aromatic organic compound.
Equation:
step by step:
It is a volatile white crystalline substance. A phenyl group is joined to a hydroxyl group to form the molecule.
The total atomic weight of the atoms in the molecule makes up the molecular weight. Phenol has the chemical formula C6H5OH.
- The carbon atom's weight is 12.
Atomic weights of hydrogen and oxygen are 1 and 16, respectively.
The atomic weights of all the atoms that make up phenol are added, and the result is that phenol has a molecular weight of
=6(12)+5(1)+16+1 =94.11
Consequently, phenol has a molecular weight of 94.11.
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Derive an expression for the pressure of an ideal gas by means of kinetic theory
The expression for the pressure of an ideal gas by means of kinetic theory is P = J / V.
How to illustrate the expression?According to the kinetic theory, a gas is made up of numerous submicroscopic particles (atoms or molecules), all of which are moving randomly and continuously. The container's walls and the quickly moving particles constantly collide in this situation.
It should be noted that based on the information, the formula illustrated will be:
f² = u²+ v² + w²
p = mv
where P = momentum
m = mass
v = velocity
Time = Distance / Speed
Force = mass × velocity² / distance
Pressure = force / area
J = mn
P = J/V
where
J = total mass
V = total volume
p = density of gas.
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2. The nonmetals in the Groups 16 and 17________
a) lose electrons when they form ions
b) gain electrons making them an anion
c) all have ions with a -1 charge
d) end in -ate
Answer:
C
Explanation:
Match the anion name on the left with the name of the acid containing that anion on the right. Not all the acid names will be used Chloride Sulfite Sulfate Chlorite1. Hydrochloric acid 2. Chloric acid 3. Chlorous acid 4. Perchlorous acid 5. Hypochlorous acid 6. Hydrochlorous acid 7. Perchloric acid 8. Sulfuric acid 9. Hydrosulfuric acid 10. Hydrosulfurous acid 11. Sulfurous acid
The anion name on the left with the name of the acid containing that anion on the right:
1) chloride Cl⁻ = hydrochloric acid
2) sulfite SO₃²⁻ = sulfurous acid
3) sulphate SO₄²⁻ = hydro sulfuric acid
4) chlorite ClO₂⁻ = chlorous acid
1) chloride Cl⁻ = hydrochloric acid because the hydrochloric acid, HCl contain anion that is Cl⁻.
2) sulfite SO₃²⁻ = sulfurous acid because the sulfurous acid H₂SO₃ that contains anion as SO₃²⁻.
3) sulphate SO₄²⁻ = hydro sulfuric acid because the hydrosulfuric acid H₂SO₄ contains the anion as SO₄²⁻.
4) chlorite ClO₂⁻ = chlorous acid because the the chlorous acid , HClO₂ contains the anion as ClO₂⁻.
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Select all the parameters that describe the physical state of a gas sample.
Temperature
Number of moles
Volume
Pressure
Clearly, the only factors that affect a substance's gaseous state at a given temperature are pressure, the number of molecules present, and its volume. The state parameters are P, V, n, and T.
What are the ideal gas's four variables?Three state variables—absolute pressure (P), volume (V), and absolute temperature—define an ideal gas (T ). We must add a fourth variable, the amount of moles, to these three state variables.
What are the top three characteristics of gas?Three characteristics of gases are as follows: They take up much more room than the liquids or solids they produce because they are (1) simple to compress, (2) expand to fill their containers, and (3) take up much more area.A good illustration of how easily gases can be compressed is an internal combustion engine.
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Carbon dioxide is collected over water at a temperature of 18°C. The pressure of water vapor
at
18°C is 2.20 kPa. If the pressure of the gas collected is 1.3 atm, what is the pressure of the dry
gas alone?
To solve such this we must know the concept of chemical reaction. Therefore, the pressure of the dry gas alone is 1.27 atm. The dry gas is always collected in water.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
pressure of water vapor = 2.20 kPa=2,200Pa = 0.022 atm
pressure of water vapor + pressure of gas =1.3 atm
substituting all the given values in the above equation, we get
0.022 atm + pressure of gas =1.3 atm
pressure of gas = 1.3 - 0.022
= 1.27 atm
Therefore, the pressure of the dry gas alone is 1.27 atm.
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How many grams of NaCl are needed to prepare 0.500 L of a 4.00 M NaCl solution?
a. 4 grams of Na cl
b. 2 grams of Na cl
c. 117 grams of na cl
d 58.5 grams of na cl
117 grams of NaCl are needed to prepare 0.500 L of a 4.00 M NaCl solution.
What is molarity ?The moles of solute per liter of solution is measured as molarity. For instance, when table salt is dissolved in water, water serves as both the solution and the solute. Sodium chloride weights 58.44 grams per mole. One molar solution, or 1M, is created by dissolving 58.44 grams of sodium chloride in one liter of water.needed to prepare 0.500 L
to find the molecular mass of NaCl from the periodic table.
The mass of Na is about 22.99 g and Cl is about 35.45 g.
The total mass of NaCl is 22.99 + 35.45 = 58.44 g.
Now we need to use the conversion factor from the definition of a mole : 1 mole NaCl = 58.44 g NaCl
We do not have moles yet so we need to find the moles from using molarity and 0.500L.
To find moles from molarity the equation is : moles = volume (L) x Molarity (moles/L)
So we substitute 0.500 L x 4 (moles/L) = 2 moles NaCl
Now we have moles and can convert them to grams :
2 moles x (58.44 g / 1 mole) = (2 x 58.44) / 1
116.88 grams NaCl
≅ 117 grams NaCl.
117 grams of NaCl are needed to prepare 0.500 L of a 4.00 M NaCl solution.
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The reaction of 6.20 g of carbon with excess O2 yields 8.35 g of CO2. What is the percent yield of this reaction?
The theoretical yield of the reaction between 6.20 g of carbon with excess oxygen is 22.7 g. The actual yield is given 8.35 g. Thus, the percent yield is 36.7 %.
What is percent yield?Percent yield of a reaction is the ratio of its actual yield to the theoretical yield multiplied by 100. The theoretical yield is calculated from the balanced chemical equation of the reaction.
One mole or 12 g of C gives one mole of carbon dioxide. Molar mass of CO₂ is 44 g/mol. Thus, the mass of carbon dioxide that can be produced from 6.20 g of C is :
= (6.20 × 44 ) / 12 g = 22.73 g.
The actual yield of CO₂ is 8.35g only. Thus, its percent yield is calculated as :
percent yield = 8.35 g/ 22.73 g × 100 = 36.7 %.
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What is the definition of supercalifragilisticexpialidocious.
Answer:
I think it means something thats very good
How many grams are in
7.84 x 1022 particles of
Zn(NO3)2?
246 grams are in 7.84 x 10²² no. particles of Zn(NO₃)₂
What are particles?A particle is any fundamental piece of matter or energy, according to science. A particle is an amount of stuff that scientists or engineers use to build hypotheses about their field of study. There are no size restrictions when defining a particle.
As we know,
molar mass of zinc (Zn) = 65.38 gm
molar mass of Zn(NO₃)₂ = 189.36 gm
or we can say,
1 mol of Zn(NO₃)₂ contains 189.36 gm of mass.
Also, 1 mol of Zn contains 6.023 × 10²³ no. of particles.
So, 6.023 × 10²³ no. of particles have mass 189.36 gm.
7.84 x 10²² no. of particles have mass 246 gm.
246 grams are in 7.84 x 10²² no. particles of Zn(NO₃)₂.
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Which of the following reacts at the fastest rate when heated with N-bromosuccinimide (NBS) and benzoyl peroxide in carbon tetrachloride at 80 degree C? A. toluene B. Ethylbenzene C. isopropylbenzene (cumene) D. tert-butylbenzene
Cumene reacts at a faster rate when heated with N-Bromo succinimide and benzoyl peroxide in carbon tetrachloride.
When NBS and benzoyl peroxide in carbon tetrachloride reacts, they follow radical mechanism, which gives a bromination reaction and the position at which bromination occurs is benzylic position. cumene is an organic compound that contains a benzene ring with an isopropyl substituent and when reacts with chlorine forms the most stable carbocation and become most acidic. Now, the most radical formed due to reaction at benzylic position is only provided by cumene because it forms 3° radical i.e., tertiary carbocations which is more stable than secondary and primary cations.
Hence, cumene reacts at a faster rate.
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