The formatted answer to the question is below.Energy required to boil hexane is 80kj
From the question, the parameters given are 64.7g of hexane,C6H14; a starting temperature of 41.9°C and bringing it to 33.2°C.
Molar mass of hexane,C6H14=86.18g/mol.
Things to know: heat capacity of hexane, C6H14= 142.6J/molK, the heat of fusion = 9.87 kj/mol.
STEP ONE(1): ENERGY USED IN MELTING HEXANE SOLID.
Using the formula below;
Energy used in melting the solid(in JOULES) = (mass of hexane/molar mass of hexane) × heat of Fusion.
=(64.7g of C6H14/86.18(g per mol) of C6H6) × 9.87 kJ per mol.
= 7.40J.
= 0.0074 kJ.
STEP TWO (2): ENERGY OF HEATING THE LIQUID.
It can be calculated from the formula below;
Energy= heat capacity (J/g.K) × mass of hexane× (∆T).
= 142.6J/molK × 64.7× (41.9-33.2).
= 80268.114
= 80.268 kJ.
Energy required to boil hexane= Energy required to melt the hexane + energy required for boiling.
= 0.0074 kJ.+80.268 kJ.
= 80.27kJ
Approximately, 80kJ
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. How many grams of CaCl₂ (molar mass = 111
g/mol) are needed to prepare 100. mL of 0.100
M solution? Show your calculation to receive
full credit.
A) 55.5 g
B) 111 g
C) 222 g
D) 555 g
Answer:
1.11 grams CaCl₂
**I am aware that this is not one of the answer choices, but I pretty confident that this should be the correct answer according the the given values
Explanation:
To find the mass of CaCl₂ necessary, you need to
(1) convert the volume from mL to L (1,000 mL = 1 L)
(2) calculate the amount of moles (M = moles / L)
(3) convert moles to grams (using the molar mass)
It is important to arrange the conversions/ratios in a way that allows for the cancellation of units. The final answer should have 3 sig figs like the given values.
(Step 1)
100. mL CaCl₂ 1 L
-------------------------- x ------------------- = 0.100 L CaCl₂
1,000 mL
(Step 2)
Molarity (M) = moles / volume (L) <----- Molarity ratio
0.100 M = moles / 0.100 L <----- Insert values
0.0100 = moles <----- Multiply both sides by 0.100 L
(Step 3)
Molar Mass (CaCl₂): 111 g/mol
0.0100 moles CaCl₂ 111 grams
--------------------------------- x --------------------- = 1.11 grams CaCl₂
1 mole
What type of reaction is this? (Multiple choice)
This reaction is an example of double displacement reaction.
What is double displacement reaction?When two reactants change ions to create two new compounds, the reaction is referred to as a double displacement reaction. Double displacement reactions usually result in the development of a precipitate as a product.
The positive-charged cations and negative-charged anions of the reactants swap places (double displacement) to generate two new products in this sort of reaction. Also called: A metathesis reaction or a double replacement reaction are other names for a double displacement reaction.
The equation becomes:
AlBr₃ + K₂SO₄ → KBr + Al₂(SO₄)₃
Aluminium bromide (AlBr₃) reacts with potassium sulphate (K₂SO₄) to form potassium bromide (KBr) along with aluminium sulphate (Al₂(SO₄)₃).
Balanced reaction becomes:
2AlBr₃ + 3K₂SO₄ → 6KBr + Al₂(SO₄)₃
2 mol 3 mol 6 mol 1 mol
In this reaction, two moles of aluminium bromide react with three moles of potassium sulphate to produce six moles of potassium bromide along with one mole of aluminium sulphate.
So, this reaction is an example of double displacement reaction.
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Perform the following operation
and express the answer in
scientific notation.
6.50×105 +5.40×104
? ]×10[?]
According to scientific notation, the answer of the operation is 7.04×10⁵.
What is scientific notation?Scientific notation is defined as a way of expressing numbers which are too large or too small so that they can be easily written in decimal form. It can be referred to the scientific form or the scientific index form or even the standard form.
Base ten notation is used by scientists, engineers as it helps in simplification of arithmetic operations. It contains the significant figures which include all non-zero numbers , the zeroes between significant digits and zeroes which are needed to be significant.
In scientific notation, the base should always be ten. The exponent should be a non-zero integer and it can be either positive or negative.In this case answer is obtained as 6.50×10⁵ +0.540×10⁵=7.04×10⁵.
Thus, the answer in scientific notation is 7.04×10⁵.
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AWARDING A LOT OF POINTS TO WHOEVER ANSWERS THESE (correctly)
1. How many moles is 55 g of NaCi?
2. How many moles is 0.025 g of NaCO3?
3.How many grams is 0.500 moles of NaCi?
1) The number of moles of the sodium chloride is 0.94 moles.
2) The number of moles of sodium carbonate is 2.4 * 10^-4 moles.
3) The mass of the sodium chloride is 29.25 g.
What is the number of moles?We know that we can be able to determine the amount of substance and that the unit of the amount of substance is the mole. The mole refers to the elementary entities that we can be able to find in the compound.
We can obtain the number of moles in each of the cases using the formula;
Number of moles = mass/ molar mass
Hence;
For sodium chloride;
55 g/58.5 g/mol
= 0.94 moles
For sodium carbonate;
0.025 g/106 g/mol
= 2.4 * 10^-4 moles
For the mass of the sodium chloride;
Mass = 0.500 moles * 58.5 g/mol
= 29.25 g
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Oxygen isotope analyses of both deep-sea cores and ice cores (from the Greenland ice sheet) show that the Pleistocene ______.
Oxygen isotope analyses of both deep-sea cores and ice cores (from the Greenland ice sheet) indicate that the Pleistocene was characterized by frequent and widespread climate variability.
This included cycles of glacial advance and retreat.
These changes were caused by variations in the Earth's orbit and tilt, affecting the amount of solar radiation received by different parts of the Earth.
The Pleistocene also saw a series of major ice ages, during which ice sheets and glaciers covered most of the Earth's surface. These ice ages were interspersed with shorter, warmer periods called interglacials. During that time, the Earth's climate resembled the present climate.
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A mixture of gases for the synthesis of ammonia with a mass of 1000.0 g at a temperature of 0 0C and pressure 2 atm occupies a volume of 1000.0 L.
1. Determine the volume fraction of gases in the mixture (in percent).
2. Write the equations for ammonia synthesis reactions in laboratories (3 methods).
3. Give the equation for the reaction of ammonia: a) with metal; b) with a non-metal; c) with metal oxide; d) with acid; e) with salt.
Answer:
1. or A. : .209%
B. : 1000.0 x .20
Explanation:
Predict the ground-state electron configuration of each ion. Use the abbreviated noble gas notation.
Cu²+
Co³ +
I got answers of:
Cu - [Ar]4s^2 3d^7 ; [Ar]3d^7 ; [Ar]3d^10 ; [Ar]4s^1 3d^10
Co - [Ar]4s^2 3d^4 ; [Ar]3d^4
And these were all wrong, please help
The electron configuration of Cu²+ ion - [tex]1s^2 2s^2 2p^6 3s^2 3p^6 3d^9[/tex]
The electron configuration of Co³ + ion - [tex]1s^2 2s^2 2p^6 3s^2 3p^6 3d^6[/tex]
What is the electron configuration?When we are talking about the electron configuration, we are talking about the way that the electron is arranged around the nucleus of the atom. We know that electrons in the atom can be arranged in energy levels in the atom of the element.
We are asked to write here the electron configuration of the copper II ion and that of the cobalt III ion. In either case, we have to know that electrons have been removed from the neutral atom. In the first case, there are two electrons that have been removed while in the second case, there are three electrons that have been removed.
Thus in writing the electron configuration of the specie we have to take into account the number of the electrons that have been lost due to ion formation. Recall that the ground state is the lowest energy state of the chemical specie.
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For the following reaction, 20.4 grams of sulfur dioxide are allowed to react with 9.97 grams of oxygen gas .
sulfur dioxide ( g ) + oxygen ( g ) sulfur trioxide ( g )
What is the maximum amount of sulfur trioxide that can be formed?
What is the FORMULA for the limiting reagent?
What amount of the excess reagent remains after the reaction is complete?
Answer:
1.3
Explanation:
in the following reaction 2Al + FeO2 ---> Al2O2 +2Fe. If 8 grams of Fe2O3 reacted with an excess of Al the maximum number of moles of Fe could be produced is ? A. 0.100 b. 0.200 c. 0.300 4. 0.400
The maximum number of moles of Fe could be produced is 0.1 option - A is correct.
How are grams and moles converted?The grams to moles formula must be used in order to accurately calculate the number of moles, n, of a substance with a given mass, m, (in grams): M is the material's molar mass, so n = m / M.
According to the periodic table, the molecular mass of iron, to three decimal places, is 55.845 and its elemental symbol is Fe.
Moles = mass/molar mass
Molar mass of Fe = 56
Number of moles of Fe = 8/56
Number of moles of Fe = 0.14moles.
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Suppose a runner completes a 10K (10.0 km) road race in 45 minutes and 35 seconds.
What is the runner's average speed in miles per hour?
The average speed of the runner in miles per hour would be 8.18 miles per hour.
What is the average speed?The average speed of a moving object is the ratio of the total distance traveled by the object and the total time taken to cover the distance. Mathematically, this can be expressed as;
Average speed = total distance traveled/ total time taken
In this case;
Total distance = 10 km
Total time = 45 minutes, 35 seconds
In order to find the average speed in miles per hour, let's convert the distance from km to mile and the time to hour.
1 km = 0.621371 mile
10 km = 10 x 0.621371
= 6.21371 miles
1 hour = 3600 seconds
60 seconds = 1 minute
45 minutes = 45 x 60
= 2700 seconds
Total time = 2700 + 35
= 2735 seconds
3600 seconds = 1 hr
2735 seconds = 2735/3600
= 0.7597 hour
The average speed of the runner in miles per hour:
6.21371/0.7597 = 8.18 miles per hour
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Which of the following is a hydroxide ion?
Select one:
O a. H*
Ob. H30
O c. (OH)*
O d. 0²-
Answer:
a
Explanation:
hope this helps for now
Two north poles facing each other will ___ each other.
repel
attract
Answer: repel
Explanation: it's not yet known why like charges repel each other, so
but there's your answer, yw.
After considering the results of the classification tests, the possibilities can be narrowed down further by determining the melting point of the
A derivative.
B Schiff addition product.
C iodoform.
D triiodo compound.
After considering the results of the classification tests, the possibilities can be narrowed down further by determining the melting point of the B Schiff addition product.
What two facts can you infer about your product based on its melting point range?
A compound's melting point is helpful in two ways: it provides information on the composition's identity and degree of purity. Impurities will affect a compound's melting point, resulting in broader and lower melting point ranges.
First, the solubility test must be performed in order to remove soluble contaminants from the target molecule. The desired chemical and the soluble impurities are dissolved in a minimum of near or boiling solvent once a suitable solvent has been selected. The solution is then given time to gradually cool.
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A balloon that contains 4.80 g of carbon dioxide gas has a volume of 12.0 L. Assume
that the pressure and temperature of the balloon remain constant. What is the new
volume of the balloon if an additional 0.50 mol of CO₂ is added? [ans: 67 L]
Answer:
the new volume of the balloon after 0.50 mol of CO2 is added is 67 L.
Explanation:
To solve this problem, we need to use the ideal gas law, which states that the pressure of a gas is directly proportional to its temperature and number of moles, and inversely proportional to its volume. This relationship can be written as:
PV = nRT
Where P is the pressure of the gas, V is the volume of the gas, n is the number of moles of the gas, R is the ideal gas constant, and T is the temperature of the gas.
In this problem, the pressure, temperature, and number of moles of the gas all remain constant, so we can rearrange the ideal gas law to solve for the volume of the gas:
V = nRT/P
Plugging in the given values, we find that the volume of the gas is:
V = (0.50 mol CO2)(0.08206 Latm/molK)(298 K)/(1 atm)
V = 67 L
It's a great day at the beach, and you're there for some fun and sun! One reason the day is so special is that the weather is so pleasant—sunny and warm. Energy from the sun warms the beach by (1) _______________. The breeze is warm enough to keep you warm, but it also keeps you from overheating. Ocean breezes move because energy is (2) ________________. When you lie down on the sand, you spread a beach towel down so that the sand will not make you too hot by (3) ______________________.
It's a great day at the beach, and you're there for some fun and sun! One reason the day is so special is that the weather is so pleasant—sunny and warm. Energy from the sun warms the beach with Radiation. The breeze is warm enough to keep you warm, but it also keeps you from overheating. Ocean breezes move because energy is Convection. When you lie down on the sand, you spread a beach towel down so that the sand will not make you too hot by transferring heat by Conduction.
Radiation is energy that comes from a source and travels through space at the speed of light. This energy has an electric field and a magnetic field.
Heat is transferred through convection, which is the large-scale movement of molecules inside gases and liquids. Conduction is used to move heat from the object to the fluid initially, but fluid motion is responsible for the bulk of the heat transfer.
Heat energy is transferred through the mechanism of conduction when nearby atoms or molecules collide. In solids and liquids, where particles are more closely spaced, conduction happens more easily than in gases, where particles are more widely spaced.
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The NMDA receptor is a neurotransmitter- and voltage-dependent ion channel. When the _____ is at the resting potential, Mg2+ blocks the ion channel, preventing Ca2+ from entering.
Answer:
postsynaptic membrane
Explanation:
Hope it helps!
Fill in my blanks
Mass - measured in ____ or tells the amount of matter in an object.
Volume - the amount of ____ that’s an odject _____ _____
Answer:
Mass - measured in kilogram or tell the amoout of matter in an object.
Volume - is the amout of space that's an object taken
Calculate the radiation dosage in rads for a 65 ‑kg person that is exposed for 4.0 s to a 3.0 Ci source of beta radiation. Assume that 100% of the radiation is absorbed and that each beta particle has an energy of 1.0×10−13 J.
The radiation dosage in rads for a 65 ‑kg person that is exposed for 4.0 s to a 3.0 Ci source of beta radiation is 8.54 x 10⁻⁴ J/kg.
What is radiation?Radiation is defined as the energy that can be depicted as waves or particles and travels from one location to another. The DNA in our cells can be harmed by radiation.
The radiation dosage is determined by the ratio of the total dose to the exposed person's mass.
3 Ci beta radiation = 3 x (3.7x10¹⁰) = 11.1 x 10¹⁰decay/s.
Total beta energy taken in over 5 seconds
Et = ( 11.1 x 10¹⁰ ) x 5 x 1.0 x 10⁻¹³
Et = 55.5 x 10⁻³
The person's radiation dose is estimated as follows;
Rd = ET / m
Rd = 55.5 x 10⁻³ / 65 kg
Rd = 8.54 x 10⁻⁴ J/kg.
Thus, the radiation dosage in rads for a 65 ‑kg person that is exposed for 4.0 s to a 3.0 Ci source of beta radiation is 8.54 x 10⁻⁴ J/kg.
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Which of the following is a heterogeneous mixture?
Opotting soil
Tap Water
Ochlorine gas (CI)
Otable salt NaCl
From the available choices, Heterogeneous combinations make up potting soil.
In heterogeneous blends, we can easily discern between the various components. The soil's components make up a heterogeneous mixture since they don't all have the same physical and chemical properties.
It's a great idea to grow indoor and potted plants in potting soil. It is typically more nutritious and well-balanced for the plants. The phrase "soil heterogeneity" refers to the diversity of soil traits or taxonomic groupings found in a certain area. Potting soil is a heterogeneous mixture since its composition is not homogeneous.
Tap water is uniform and impossible to identify salt particles without the proper equipment since salt virtually completely dissolves into it.
Chlorine gas (Cl) is a component of homogeneous compounds. Potassium and chlorine are a mixture because all of the components are heterogeneous, or separate.
Table salt is a homogeneous mixture. It contains several ingredients, hence it is not a compound.
The only heterogeneous substance would be potting soil since, without the use of specialist equipment, we can see a variety of particles with different sizes, forms, colors, and other properties.
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How much energy is required to heat 100g of water at 25°C to steam at 125°C?
The amount of energy required to heat 100 g of water is 268000 J.
What is energy?Energy is the ability or the capacity to perform work.
To calculate the amount heat energy required to change the water to steam, we use the formula below.
Formula:
Q = CmΔt+cΔt........... Equation 1Where:
Q = Amount of energym = Mass of the waterΔt = Change in temperature of the waterc = Latent heat of vapourization of waterC = Specific heat capacity of the waterFrom the question,
Given:
m = 100 g = 0.1 kgΔt = 125-25 = 100 °CC = 4200 J/kg°C. c = 2260000 J/kgSubstitute these values into equation 1
Q = (0.1×100×4200)+(2260000×0.1)Q = 42000+226000Q = 268000 JHence, the amount of energy required is 268000 J.
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An unknown salt AS X H₂O was analyzed and found to contain 16.4 percent
.
water. If the anhydrous salt has a formula mass of 183 amu, find the water of
crystallization (X) for the hydrate.
the unknown salt AS X H₂O was analyzed and found to contain 16.4 percent water. If the anhydrous salt has a formula mass of 183 amu then the water of crystallization (X) for the hydrate is 7.
What is anhydrous salt?Those compound from which all the water molecules are removed is termed as anhydrous salt. These types of compounds can be used as desiccants (drying agents) that means they can absorb water from their surrounding.
Water of crystallization:In a crystalline state of a salt the no. of molecules of water are present in a definite molecular proportion is known as Water of crystallization.
Example : CaSO4.5H2O consist of 5 Water of crystallization.
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Analyses revealed that 16.4% of the unidentified salt AS X H2O contained water. The hydrate's water of crystallisation (X) is 7 if the anhydrous salt's formula mass is 183 amu.
What is sodium anhydrous?
Anhydrous salts are substances from which all of the water molecules have been eliminated. These kinds of substances can serve as desiccants, or drying agents, by absorbing water from their surroundings.
Water of crystallisation is the term used to describe the quantity of water molecules present in a specific molecular proportion in a salt that has crystallised.
Example: The water of crystallization for CaSO4.5H2O is 5.
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Why do you think the Haití earthquake in 2010 happened?
Both Saturday's earthquake and the one in 2010 are thought to have been caused by the Enriquillo-Plantain Garden fault system, according to the United States.
What is the Haitian problem with the Enriquillo-plantain garden?The Enriquillo-Plantain Garden fault zone (EPGFZ or EPGZ) is indeed a network of active coaxial left lateral-moving strike - slip faults faults that extends along the southern coast of Hispaniola, the island that is home to Haiti and the Dominican Republic.
Where is the fault system between Enriquillo and Plantain Garden?
As one of Haiti's main plate-bounding fault systems, the Enriquillo-Plantain Garden fault zone is very well known. Initially believed to be the cause of the Mw 7.0 earthquake that struck Port-au-Prince on January 12, 2010, the strike-slip fault is located close to the city.
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Classify each chemical reaction as endothermic or exothermic.
You are currently in a sorting module. Turn off browse mode or quick nav, Tab to items, Space or Enter to pick up, Tab to move, Space or Enter to drop.
Endothermic reactions
Exothermic reactions
Answer Bank
2H2(g)+O2(g)⟶2H2O(l)+heat2C2H2(g)+5O2(g)⟶4CO2(g)+2H2O(l)+heatCH4O(l)+heat⟶CO(g)+2H2(g)
2CO2(g)+heat⟶2CO(g)+O2(g)
Exothermic reactions are
1) 2H2+O2 ⇒2H20+Heat
2) 2C2H2+5O2⇒4CO2+2H20+Heat
Endothermic reactions are
3) CH4+Heat ⇒CO+2H2
4) 2CO2+Heat⇒2CO+O2
What are exothermic and endothermic reactions?
Exothermic reactions are those reactions in which energy is released and in endothermic reactions energy is required to proceed the reaction.
1) & 2) are exothermic because energy is released in reaction 3) & 4) are endothermic because energy is required so called endothermic reaction.
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Multiple choice (please help)
Given chemical equation:
CuSO₄ + 2HI → Cu₂SO₄ + I₂ + H₂SO₄
CuSO₄ + 2HI - reactants (option - b) is correct.
A chemical equation consists of what components?A chemical equation is composed of the "yields" arrow, the "reactants," and the "products" components. Compounds or elements that are required for the reaction and go through chemical change while the reaction is occurring are known as reactants. Yield is typically represented by an arrow in reactions and refers to the ability to "produce" or "form."
Numerous observable factors, such as color change, energy change (such as a rise in temperature or the production of light), gas production, precipitate formation, and changes in physical properties, can be used to detect chemical reactions.
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A sample of 200g of an isotope decays to another isotope according to the function
(a) How much of the initial sample will be left in the sample after 25 years?
(b) How long will it take the initial sample to decay to half of its original amount?
(a) After 25 years, about g of the sample will be left.
(Round to the nearest hundredth as needed.)
a. Around 0.50g would be left in the sample after 25 years.
How long will it take the initial sample to decay to half of its original amount?
The initial sample will take 5 years to decay to half of its original amountWhat is isotope?
Isotopes are atoms with the same number of protons but differing numbers of neutrons. They differ in mass, which affects their physical characteristics even if they have almost identical chemical properties.Give an example of isotope?
Isotopes are atoms that are part of the same element and have the same atomic number Z but a different mass number A. For instance, three isotopes of the element carbon, having respective masses of 12, 13, and 14, are carbon-12, carbon-13, and carbon-14.To know more about isotopes checkout this link:
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2. How many grams of oxygen are formed when 52 grams of aluminum chlorate are
decomposed (Al(ClO3)3)?
(6 pts. /2 pts. for equation - 3 pts. for stoich - 1 pt. final answer)
The mass of the oxygen that is formed from the decomposition of the aluminium chlorate is 27.4 g.
What is a decomposition reaction?We define a decomposition reaction as the kind of reaction that involves the break up of a substance so as to obtain the components of the substance.
The compound that is being broken up can be shown in the equation that we have below;
2Al(ClO₃)₃ → 2AlCl₃ + 9O₂
Thus
Number of moles of aluminum chlorate = mass/ molar mass
= 52 grams /277 g/mol
= 0.19 moles
If 2 moles of aluminum chlorate would form 9 moles of oxygen
0.19 moles of aluminum chlorate would form 0.19 moles * 9/2
= 0.855 moles
Mass of the oxygen = 0.855 moles * 32 g/mol
= 27.4 g
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What is the reaction equation for NaK or Sodium Metal and Potassium Metal
WILL GIVE BRAINLIEST
Sodium reacts faster, producing enough heat to melt itself and occasionally ignite the hydrogen gas, resulting in the characteristic yellow-orange flame of sodium. The potassium reacts violently, bursting into a flame with the typical violet color of potassium.
What is potassium ?Potassium has the chemical symbol K and the atomic number 19. Potassium is a silvery-white metal that can be cut with a knife with little effort. In seconds, potassium metal reacts with atmospheric oxygen to form flaky white potassium peroxide.
Sodium and potassium, for example, react violently with cold water. These are exothermic reactions. The reaction is so violent and exothermic that the hydrogen produced instantly catches fire.
Thus, The potassium reacts violently, bursting into a flame with the typical violet color of potassium.
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Find the number of grams in a 1.25 M solution of potassium nitrate (NO3) if we have
160 ml of the solution.
Answer:
12.4 g
Explanation:
M=1.25M
v=0.16L
molar mass = 62 g per mole
M=n/v
n=M*v
n=1.25M*0.16
n=0.2moln=mass of a substance /molar massmass of substance = n * M
m=0.2mole *62 g/mole
m=12.4g
Which of the following standard enthalpy of formation values are not zero at 25 oC? Select all that apply. a. Ne(g)b. Hg(l)c. Na(s)d. H(g)e. Ag(s)f. S8(s)(rhombic)
H, S8(monoclinic), as well as Methane are the appropriate responses (g). For these three chemicals, overall enthalpy of production is not zero.
Entropy vs. enthalpy: what are they?Entropy is the quantity of inherent disorder within a substance, whereas enthalpy is the quantity of internal energy. Enthalpy is greater than 0 for water since it is equal for elemental compounds like hydrogen gas and gaseous oxygen (regardless of phase).
What distinguishes enthalpy from energy?Enthalpy with internal energy vary primarily in that internal energy is the total of a system's both potential and kinetic energy, whilst enthalpy is indeed the heat absorbed is evolved through chemical processes that take place in a system.
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The question I need help with is in the photo
Answer: 144.2
Explanation:
Note that [tex]23.0^{\circ}\text{C}=298.0\text{ K}[/tex].
Using the formula [tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex] yields:
[tex]\frac{2.45}{T_1}=\frac{1.75}{298}\\\\T_1=\frac{298 \times 2.45}{1.75} \text{ K}\\\\T_1=\frac{298 \times 2.45}{1.75}-273^{\circ}\text{C}\\\\T_1=144.2^{\circ}\text{C}[/tex]