Question 1

Which of the following has the largest entropy?

Accepted Answer

A)  B2F4 (g) 
B)  BF3 (g) 
C)  B2H6 (g) 
D)  BCl3 (l) 
E)  B2O3 (s) F) B) and E)
G) All of the above

Question 2

Which of the following statements is true?

Accepted Answer

A)  Processes that are spontaneous in one direction are spontaneous in the opposite direction.
B)  Processes are spontaneous because they occur at an observable rate.
C)  Spontaneity can depend on the temperature.
D)  All of the statements are true.E) None of the above
F) All of the above

Question 3

With thermodynamics,one cannot determine ________.

Accepted Answer

A)  the speed of a reaction
B)  the direction of a spontaneous reaction
C)  the extent of a reaction
D)  the value of the equilibrium constant
E)  the temperature at which a reaction will be spontaneousF) A) and E)
G) None of the above

Question 4

The value of ΔH° for the decomposition of gaseous sulfur dioxide to solid elemental sulfur and gaseous oxygen, SO2 (g) → S (s,rhombic) + O2 (g) 
Is ________ kJ/mol.

Accepted Answer

A)  0.0
B)  +135.0
C)  -135.90
D)  -269.9
E)  +269.9F) B) and C)
G) A) and D)

Question 5

The value of ΔH° for the formation of POCl3 from its constituent elements, P2 (g) + O2 (g) + 3Cl2 (g) → 2POCl3 (g) 
Is ________ kJ/mol.

Accepted Answer

A)  -1228.7
B)  -397.7
C)  -686.5
D)  +1228.7
E)  +686.5F) A) and D)
G) None of the above

Question 6

Consider the reaction: FeO (s) + Fe (s) + O2 (g) → Fe2O3 (s) 
Given the following table of thermodynamic data, 2 (g) → Fe2O3 (s)  Given the following table of thermodynamic data,   determine the temperature (in °C) at which the reaction is nonspontaneous. A) below 618.1 B) above 2438 C) above 756.3 D) below 2438 E) This reaction is spontaneous at all temperatures." class="answers-bank-image d-inline" rel="preload" > determine the temperature (in °C) at which the reaction is nonspontaneous.

Accepted Answer

A)  below 618.1
B)  above 2438
C)  above 756.3
D)  below 2438
E)  This reaction is spontaneous at all temperatures.F) C) and E)
G) All of the above

Question 7

Which of the following has the largest entropy?

Accepted Answer

A)  HI (g) 
B)  HBr (g) 
C)  HCl (g) 
D)  HCl (s) 
E)  HCl (l) F) A) and E)
G) All of the above

Question 8

A reversible process is one that ________.

Accepted Answer

A)  can be reversed with no net change in either system or surroundings
B)  happens spontaneously
C)  is spontaneous in both directions
D)  must be carried out at low temperature
E)  must be carried out at high temperatureF) A) and D)
G) B) and C)

Question 9

Consider the reaction: Ag+ (aq) + Cl- (aq) → AgCl (s) 
Given the following table of thermodynamic data, + (aq) + Cl- (aq) → AgCl (s)  Given the following table of thermodynamic data,   determine the temperature (in °C) above which the reaction is nonspontaneous under standard conditions. A) 1230 B) 150 C) 432 D) 133 E) 1640" class="answers-bank-image d-inline" rel="preload" > determine the temperature (in °C) above which the reaction is nonspontaneous under standard conditions.

Accepted Answer

A)  1230
B)  150
C)  432
D)  133
E)  1640F) B) and D)
G) B) and E)

Question 10

The value of ΔG° at 261.0 °C for the formation of phosphorous trichloride from its constituent elements, 5 D) -651.7 E) -861.4" class="answers-bank-image d-inline" rel="preload" > (g) + 5 D) -651.7 E) -861.4" class="answers-bank-image d-inline" rel="preload" > (g) → 5 D) -651.7 E) -861.4" class="answers-bank-image d-inline" rel="preload" > (g)  is ________ kJ/mol.At 25.0 °C for this reaction,ΔH° is -720.5 kJ/mol,ΔG° is 5 D) -651.7 E) -861.4" class="answers-bank-image d-inline" rel="preload" > and 5 D) -651.7 E) -861.4" class="answers-bank-image d-inline" rel="preload" > is 5 D) -651.7 E) -861.4" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  -579.6
B)  6.81 × 5 
D)  -651.7 
E)  -861.4" class="answers-bank-image d-inline" rel="preload" >
C)  1.40 × 105
D)  -651.7
E)  -861.4F) D) and E)
G) A) and C)

Question 11

The value of ΔG° at 25 °C for the decomposition of POCl3 into its constituent elements, 2POCl3 (g) → P2 (g) + O2 (g) + 3Cl2 (g) 
Is ________ kJ/mol.

Accepted Answer

A)  -1108.7
B)  +1108.7
C)  -606.2
D)  +606.2
E)  -1,005F) None of the above
G) C) and D)

Question 12

The equilibrium constant for the following reaction is 3.0 ×  at 25 °C.  (g) + 3  (g)   2N  (g)  The value of ΔG° for this reaction is ________ kJ/mol.

Accepted Answer

A)  22
B)  -4.1
C)  4.1
D)  -48
E)  -22F) A) and B)
G) B) and D)

Question 13

What is the equilibrium constant for a reaction at 25 °C.The value of ΔG° is -57.5 kJ/mol.

Accepted Answer

A)  8.4 × 10101
B)  10
C)  1.0
D)  1.2 × 1010
E)  more information is neededF) B) and E)
G) A) and E)

Question 14

The normal boiling point of water is 100.0 °C and its molar enthalpy of vaporization is 40.67 kJ/mol.What is the change in entropy in the system in J/K when 24.7 grams of steam at 1 atm condenses to a liquid at the normal boiling point?

Accepted Answer

A)  88.8
B)  -88.8
C)  -150
D)  373
E)  -40.7F) A) and B)
G) C) and D)

Question 15

The value of ΔH° for the decomposition of POCl3 into its constituent elements, 2POCl3 (g) → P2 (g) + O2 (g) + 3Cl2 (g) 
Is ________ kJ/mol.

Accepted Answer

A)  -1228.7
B)  +1228.7
C)  -940.1
D)  +940.1
E)  0.00F) C) and D)
G) B) and D)

Question 16

At what temperature (in K)will a reaction become spontaneous?
 ΔH is 115.0 kJ/mol and ΔS is 75.00 J/K ∙ mol.

Accepted Answer

The answer of At what temperature (in K)will a reaction...

Question 17

Which one of the following processes produces a decrease in the entropy of the system?

Accepted Answer

A)  freezing of Fe(l) into Fe(s) 
B)  evaporation of liquid ethanol into gaseous ethanol
C)  dissolution of LiOH(s) in water
D)  melting ice to form water
E)  mixing of two gases into one containerF) A) and B)
G) A) and C)

Question 18

The value of ΔG° for a reaction conducted at 25 °C is 3.05 kJ/mol.The equilibrium constant for a reaction is ________ at this temperature.

Accepted Answer

A)  0.292
B)  -4.20
C)  0.320
D)  -1.13
E)  More information is needed.F) A) and B)
G) A) and E)

Question 19

The value of ΔS° for the decomposition of calcium chloride into its constituent elements, CaCl2 (s) → Ca (s) + Cl2 (g) 
Is ________ J/K ∙ mol.

Accepted Answer

A)  -104.6
B)  +104.6
C)  +369.0
D)  -159.8
E)  +159.8F) D) and E)
G) B) and C)

Question 20

ΔS is positive for the reaction ________.

Accepted Answer

A)  Pb(NO3) 2 (aq) + 2KI(aq) → PbI2 (s) + 2KNO3 (aq) 
B)  2H2O (g) → 2H2 (g) + O2 (g) 
C)  H2O (g) → H2O (s) 
D)  NO (g) + O2 (g) → NO2 (g) 
E)  Ag+ (aq) + Cl- (aq) → AgCl (s) F) All of the above
G) A) and B)

Exam 19: Chemical Thermodynamics

Which of the following statements is true?

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The value of ΔH° for the decomposition of gaseous sulfur dioxide to solid elemental sulfur and gaseous oxygen, SO2 (g) → S (s,rhombic) + O2 (g) Is ________ kJ/mol.

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With thermodynamics,one cannot determine ________.

Correct AnswerverifiedShow Answer

The value of ΔH° for the decomposition of POCl3 into its constituent elements, 2POCl3 (g) → P2 (g) + O2 (g) + 3Cl2 (g) Is ________ kJ/mol.

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ΔS is positive for the reaction ________.

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Which of the following has the largest entropy?

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The normal boiling point of water is 100.0 °C and its molar enthalpy of vaporization is 40.67 kJ/mol.What is the change in entropy in the system in J/K when 24.7 grams of steam at 1 atm condenses to a liquid at the normal boiling point?

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Consider the reaction: Ag+ (aq) + Cl- (aq) → AgCl (s) Given the following table of thermodynamic data, determine the temperature (in °C) above which the reaction is nonspontaneous under standard conditions.

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The value of ΔG° for a reaction conducted at 25 °C is 3.05 kJ/mol.The equilibrium constant for a reaction is ________ at this temperature.

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The value of ΔG° at 261.0 °C for the formation of phosphorous trichloride from its constituent elements, (g) + (g) → (g) is ________ kJ/mol.At 25.0 °C for this reaction,ΔH° is -720.5 kJ/mol,ΔG° is and is

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Consider the reaction: FeO (s) + Fe (s) + O2 (g) → Fe2O3 (s) Given the following table of thermodynamic data, determine the temperature (in °C) at which the reaction is nonspontaneous.

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The equilibrium constant for the following reaction is 3.0 × at 25 °C. (g) + 3 (g) 2N (g) The value of ΔG° for this reaction is ________ kJ/mol.

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At what temperature (in K)will a reaction become spontaneous? ΔH is 115.0 kJ/mol and ΔS is 75.00 J/K ∙ mol.

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The value of ΔS° for the decomposition of calcium chloride into its constituent elements, CaCl2 (s) → Ca (s) + Cl2 (g) Is ________ J/K ∙ mol.

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The value of ΔG° at 25 °C for the decomposition of POCl3 into its constituent elements, 2POCl3 (g) → P2 (g) + O2 (g) + 3Cl2 (g) Is ________ kJ/mol.

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Which one of the following processes produces a decrease in the entropy of the system?

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Which of the following has the largest entropy?

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The value of ΔH° for the formation of POCl3 from its constituent elements, P2 (g) + O2 (g) + 3Cl2 (g) → 2POCl3 (g) Is ________ kJ/mol.

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What is the equilibrium constant for a reaction at 25 °C.The value of ΔG° is -57.5 kJ/mol.

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A reversible process is one that ________.

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The value of ΔH° for the decomposition of gaseous sulfur dioxide to solid elemental sulfur and gaseous oxygen, SO₂ (g) → S (s,rhombic) + O₂ (g) Is ________ kJ/mol.

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The value of ΔH° for the decomposition of POCl₃ into its constituent elements, 2POCl₃ (g) → P₂ (g) + O₂ (g) + 3Cl₂ (g) Is ________ kJ/mol.

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Consider the reaction: Ag⁺ (aq) + Cl^- (aq) → AgCl (s) Given the following table of thermodynamic data, determine the temperature (in °C) above which the reaction is nonspontaneous under standard conditions.

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Consider the reaction: FeO (s) + Fe (s) + O₂(g) → Fe₂O₃ (s) Given the following table of thermodynamic data, determine the temperature (in °C) at which the reaction is nonspontaneous.

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The value of ΔS° for the decomposition of calcium chloride into its constituent elements, CaCl₂(s) → Ca (s) + Cl₂ (g) Is ________ J/K ∙ mol.

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The value of ΔG° at 25 °C for the decomposition of POCl₃ into its constituent elements, 2POCl₃ (g) → P₂ (g) + O₂ (g) + 3Cl₂ (g) Is ________ kJ/mol.

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The value of ΔH° for the formation of POCl₃ from its constituent elements, P₂ (g) + O₂ (g) + 3Cl₂ (g) → 2POCl₃ (g) Is ________ kJ/mol.

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