Question 1

At 298 K the average kinetic energy is the same for H2,He,and N2.The gas with the highest average velocity is

Accepted Answer

A)  H2.
B)  He.
C)  N2.
D)  All have the same average velocity.

Question 2

The heat of vaporization of water at 100°C is 40.66 kJ/mol.Calculate the quantity of heat that is absorbed/released when 9.00 g of steam condenses to liquid water at 100°C.

Accepted Answer

A)  20.3 kJ of heat are absorbed.
B)  20.3 kJ of heat are released.
C)  81.3 kJ of heat are absorbed.
D)  81.3 kJ of heat are released.

Question 3

Which thermodynamic function is most related to disorder and probability?

Accepted Answer

A)  enthalpy
B)  internal energy
C)  entropy
D)  heat capacity

Question 4

Acetylene torches utilize the following reaction:
2 C2H2(g) + 5 O2(g) → 4 CO2(g) + 2 H2O(g) 
Use the given standard enthalpies of formation to calculate ΔH° for this reaction. 2H2(g) + 5 O2(g) → 4 CO2(g) + 2 H2O(g)  Use the given standard enthalpies of formation to calculate ΔH° for this reaction.   A) 2512.4 kJ B) 1256.2 kJ C) -1256.2 kJ D) -2512.4 kJ" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  2512.4 kJ
B)  1256.2 kJ
C)  -1256.2 kJ
D)  -2512.4 kJ

Question 5

-What are the signs of ΔH and ΔS for the reaction represented in the above drawing?

Accepted Answer

A)  ΔH = +,ΔS = +
B)  ΔH = +,ΔS = -
C)  ΔH = -,ΔS = +
D)  ΔH = -,ΔS = -

Question 6

At constant pressure for the reaction shown below,what can be said about PΔV and ΔE?
N2(g) + 3 H2(g) → 2 NH3(g) ΔH° = - 92.2 kJ

Accepted Answer

A) PΔV > 0 and ΔE > -92.2 kJ B) PΔV > 0 and ΔE C) PΔV -92.2 kJ D) PΔV < 0 and ΔE < -92.2 kJ

Question 7

Methanol can be produced from carbon monoxide and hydrogen with suitable catalysts:
CO(g) + 2 H2(g) → CH3OH(l) at 25°C ΔH° = -128.1 kJ and ΔS° = -332 J/K
Find ΔG° at 25°C.

Accepted Answer

A)  -157.2 kJ
B)  -29.1 kJ
C)  98.9 kJ
D)  157.2 kJ

Question 8

For the reaction 2CH4 (g) + 3 Cl2 (g) → 2 CHCl3 (l) + 3 H2 (g) ,ΔH° = -118.6 kJ.
ΔH°f = -134.1 kJ/mol for CHCl3 (l) .Find ΔH°f for CH4 (g) .

Accepted Answer

A)  -193.4 kJ/mol
B)  -74.8 kJ/mol
C)  74.8 kJ/mol
D)  193.4 kJ/mol

Question 9

For a process at constant pressure,

Accepted Answer

A)  ΔE = w and q = 0.
B)  ΔE = q and w = 0.
C)  ΔE = ΔH.
D)  ΔH = q.

Question 10

Kinetic energy increases with increasing ________ and increasing ________.

Accepted Answer

The answer of Kinetic energy increases with increasing ________ and...

Question 11

The following drawing is a representation of a reaction for which ΔH° = +62 kJ.This reaction is likely to be

Accepted Answer

A)  nonspontaneous at all temperatures.
B)  nonspontaneous at low temperatures and spontaneous at high temperatures.
C)  spontaneous at low temperatures and nonspontaneous at high temperatures.
D)  spontaneous at all temperatures.

Question 12

Water has an unusually high

Accepted Answer

A)  electrical conductivity.
B)  heat of combustion.
C)  heat of formation.
D)  specific heat.

Question 13

Which of the following is not a state function?

Accepted Answer

A)  altitude
B)  heat
C)  internal energy
D)  volume

Question 14

How much heat is absorbed/released when 20.00 g of NH3(g) reacts in the presence of excess O2(g) to produce NO(g) and H2O(l) according to the following chemical equation?
4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(l) ΔH° = +1168 kJ

Accepted Answer

A)  342.9 kJ of heat are absorbed.
B)  342.9 kJ of heat are released.
C)  1372 kJ of heat are absorbed.
D)  1372 kJ of heat are released.

Question 15

He gas is contained in a one-liter flask that is connected to an empty one-liter flask with a closed stopcock between the two flasks.When the stopcock is opened some of the He enters the evacuated flask.For this system

Accepted Answer

A)  ΔH is negative and ΔS is positive
B)  ΔH is zero and Δ△S is positive
C)  ΔH is zero and ΔS is negative
D)  ΔH is positive and ΔS is negative

Question 16

Calculate the total quantity of heat required to convert 25.0 g of liquid CCl4(l) from 35.0°C to gaseous CCl4 76.8°C (the normal boiling point for CCl4) ? The specific heat of CCl4(l) is
0) 857 J/(g ∙°C) ,its heat of fusion is 3.27 kJ/mol,and its heat of vaporization is 29.82 kJ/mol.

Accepted Answer

A)  0) 896 kJ
B)  1) 43 kJ
C)  5) 74 kJ
D)  6) 28 kJ

Question 17

Which is not a spontaneous process?

Accepted Answer

A)  combustion of gasoline to produce carbon dioxide and water
B)  diffusion of perfume in a room
C)  dissolution of sodium chloride in water
D)  freezing of water at 1°C

Question 18

When 1.50 g of Ba(s) is added to 100.00 g of water in a container open to the atmosphere,the reaction shown below occurs and the temperature of the resulting solution rises from 22.00°C to 33.10°C.If the specific heat of the solution is 4.18 J/(g ∙ °C) ,calculate ΔH for the reaction,as written.
Ba(s) + 2 H2O(l) → Ba(OH) 2(aq) + H2(g) ΔH = ?

Accepted Answer

A)  -431 kJ
B)  -3.14 kJ
C)  +3.14 kJ
D)  +431 kJ

Question 19

When the reaction below is performed in a water bath,will the temperature of the water bath increase or decrease?
432 kJ + A + 2 B → 3 C

Accepted Answer

The answer of When the reaction below is performed in...

Question 20

The net reaction is represented by

Accepted Answer

A)  arrow A.
B)  arrow B.
C)  arrow C.
D)  line F.

Exam 8: Thermochemistry: Chemical Energy

Correct Answer
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The net reaction is represented by

Correct Answer
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Which thermodynamic function is most related to disorder and probability?

Correct Answer
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-What are the signs of ΔH and ΔS for the reaction represented in the above drawing?

Correct Answer
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When the reaction below is performed in a water bath,will the temperature of the water bath increase or decrease? 432 kJ + A + 2 B → 3 C

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Kinetic energy increases with increasing and increasing .

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The heat of vaporization of water at 100°C is 40.66 kJ/mol.Calculate the quantity of heat that is absorbed/released when 9.00 g of steam condenses to liquid water at 100°C.

Correct Answer
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At 298 K the average kinetic energy is the same for H₂,He,and N₂.The gas with the highest average velocity is

Correct Answer
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Calculate the total quantity of heat required to convert 25.0 g of liquid CCl₄(l) from 35.0°C to gaseous CCl₄ 76.8°C (the normal boiling point for CCl₄) ? The specific heat of CCl₄(l) is 0) 857 J/(g ∙°C) ,its heat of fusion is 3.27 kJ/mol,and its heat of vaporization is 29.82 kJ/mol.

Correct Answer
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He gas is contained in a one-liter flask that is connected to an empty one-liter flask with a closed stopcock between the two flasks.When the stopcock is opened some of the He enters the evacuated flask.For this system

Correct Answer
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Methanol can be produced from carbon monoxide and hydrogen with suitable catalysts: CO(g) + 2 H₂(g) → CH₃OH(l) at 25°C ΔH° = -128.1 kJ and ΔS° = -332 J/K Find ΔG° at 25°C.

Correct Answer
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The following drawing is a representation of a reaction for which ΔH° = +62 kJ.This reaction is likely to be

Correct Answer
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Water has an unusually high

Correct Answer
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Which of the following is not a state function?

Correct Answer
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How much heat is absorbed/released when 20.00 g of NH₃(g) reacts in the presence of excess O₂(g) to produce NO(g) and H₂O(l) according to the following chemical equation? 4 NH₃(g) + 5 O₂(g) → 4 NO(g) + 6 H₂O(l) ΔH° = +1168 kJ

Correct Answer
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For the reaction 2CH₄ (g) + 3 Cl₂ (g) → 2 CHCl₃ (l) + 3 H₂ (g) ,ΔH° = -118.6 kJ. ΔH°_f = -134.1 kJ/mol for CHCl₃ (l) .Find ΔH°_f for CH₄ (g) .

Correct Answer
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At constant pressure for the reaction shown below,what can be said about PΔV and ΔE? N₂(g) + 3 H₂(g) → 2 NH₃(g) ΔH° = - 92.2 kJ

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Which is not a spontaneous process?

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Acetylene torches utilize the following reaction: 2 C₂H₂(g) + 5 O₂(g) → 4 CO₂(g) + 2 H₂O(g) Use the given standard enthalpies of formation to calculate ΔH° for this reaction.

Correct Answer
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For a process at constant pressure,

Correct Answer
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Exam 8: Thermochemistry: Chemical Energy

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The net reaction is represented by

Correct AnswerverifiedShow Answer

Which thermodynamic function is most related to disorder and probability?

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-What are the signs of ΔH and ΔS for the reaction represented in the above drawing?

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When the reaction below is performed in a water bath,will the temperature of the water bath increase or decrease? 432 kJ + A + 2 B → 3 C

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Kinetic energy increases with increasing ________ and increasing ________.

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The heat of vaporization of water at 100°C is 40.66 kJ/mol.Calculate the quantity of heat that is absorbed/released when 9.00 g of steam condenses to liquid water at 100°C.

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At 298 K the average kinetic energy is the same for H2,He,and N2.The gas with the highest average velocity is

Correct AnswerverifiedShow Answer

Calculate the total quantity of heat required to convert 25.0 g of liquid CCl4(l) from 35.0°C to gaseous CCl4 76.8°C (the normal boiling point for CCl4) ? The specific heat of CCl4(l) is 0) 857 J/(g ∙°C) ,its heat of fusion is 3.27 kJ/mol,and its heat of vaporization is 29.82 kJ/mol.

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He gas is contained in a one-liter flask that is connected to an empty one-liter flask with a closed stopcock between the two flasks.When the stopcock is opened some of the He enters the evacuated flask.For this system

Correct AnswerverifiedShow Answer

Methanol can be produced from carbon monoxide and hydrogen with suitable catalysts: CO(g) + 2 H2(g) → CH3OH(l) at 25°C ΔH° = -128.1 kJ and ΔS° = -332 J/K Find ΔG° at 25°C.

Correct AnswerverifiedShow Answer

The following drawing is a representation of a reaction for which ΔH° = +62 kJ.This reaction is likely to be

Correct AnswerverifiedShow Answer

Water has an unusually high

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Which of the following is not a state function?

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How much heat is absorbed/released when 20.00 g of NH3(g) reacts in the presence of excess O2(g) to produce NO(g) and H2O(l) according to the following chemical equation? 4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(l) ΔH° = +1168 kJ

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For the reaction 2CH4 (g) + 3 Cl2 (g) → 2 CHCl3 (l) + 3 H2 (g) ,ΔH° = -118.6 kJ. ΔH°f = -134.1 kJ/mol for CHCl3 (l) .Find ΔH°f for CH4 (g) .

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At constant pressure for the reaction shown below,what can be said about PΔV and ΔE? N2(g) + 3 H2(g) → 2 NH3(g) ΔH° = - 92.2 kJ

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Which is not a spontaneous process?

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Acetylene torches utilize the following reaction: 2 C2H2(g) + 5 O2(g) → 4 CO2(g) + 2 H2O(g) Use the given standard enthalpies of formation to calculate ΔH° for this reaction.

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For a process at constant pressure,

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Kinetic energy increases with increasing and increasing .

Correct Answer
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Correct Answer
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At 298 K the average kinetic energy is the same for H₂,He,and N₂.The gas with the highest average velocity is

Correct Answer
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Calculate the total quantity of heat required to convert 25.0 g of liquid CCl₄(l) from 35.0°C to gaseous CCl₄ 76.8°C (the normal boiling point for CCl₄) ? The specific heat of CCl₄(l) is 0) 857 J/(g ∙°C) ,its heat of fusion is 3.27 kJ/mol,and its heat of vaporization is 29.82 kJ/mol.

Correct Answer
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Correct Answer
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Methanol can be produced from carbon monoxide and hydrogen with suitable catalysts: CO(g) + 2 H₂(g) → CH₃OH(l) at 25°C ΔH° = -128.1 kJ and ΔS° = -332 J/K Find ΔG° at 25°C.

Correct Answer
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How much heat is absorbed/released when 20.00 g of NH₃(g) reacts in the presence of excess O₂(g) to produce NO(g) and H₂O(l) according to the following chemical equation? 4 NH₃(g) + 5 O₂(g) → 4 NO(g) + 6 H₂O(l) ΔH° = +1168 kJ

Correct Answer
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For the reaction 2CH₄ (g) + 3 Cl₂ (g) → 2 CHCl₃ (l) + 3 H₂ (g) ,ΔH° = -118.6 kJ. ΔH°_f = -134.1 kJ/mol for CHCl₃ (l) .Find ΔH°_f for CH₄ (g) .

Correct Answer
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At constant pressure for the reaction shown below,what can be said about PΔV and ΔE? N₂(g) + 3 H₂(g) → 2 NH₃(g) ΔH° = - 92.2 kJ

Correct Answer
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Correct Answer
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Acetylene torches utilize the following reaction: 2 C₂H₂(g) + 5 O₂(g) → 4 CO₂(g) + 2 H₂O(g) Use the given standard enthalpies of formation to calculate ΔH° for this reaction.

Correct Answer
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Correct Answer
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