Question 1

Predict the sign of $\Delta$S for the reaction 6CO2(g)+ 6H2O(g)$\to$ C6H12O6(g)+ 6O2(g).

Accepted Answer

The answer of Predict the sign of $\Delta$S for the...

Question 2

Aluminum forms a layer of aluminum oxide when exposed to air which protects the bulk metal from further corrosion. 4Al(s) + 3O2(g)  →	o→ 2Al2O3(s) 
Calculate  Δ\DeltaΔ G° for this reaction, given that  Δ\DeltaΔ G°f of aluminum oxide is -1576.4 kJ/mol.

Accepted Answer

A)  -3152.8 kJ/mol
B)  -1576.4 kJ/mol
C)  -788.2 kJ/mol
D)  1576.4 kJ/mol
E)  3152.8 kJ/mol F) B) and C)
G) A) and E)

Question 3

Find the temperature at which Kp = 4.00 for the reaction N2O4(g)  p = 4.00 for the reaction N2O4(g)    2NO2(g) .[Given: at 25°C, for NO2(g) ,  \Delta H°f = 33.85 kJ/mol, S° = 240.46 J/mol·K; for N2O4(g) ,  \Delta H°f = 9.66 kJ/mol, S° = 304.3 J/mol·K; assume that \Delta H° and  \Delta S° are independent of temperature.] A) 197 °C B) 56 °C C) 36 °C D) 79 °C E) 476°C " class="answers-bank-image d-inline" rel="preload" > 2NO2(g) .[Given: at 25°C, for NO2(g) ,  Δ\DeltaΔ H°f = 33.85 kJ/mol, S° = 240.46 J/mol·K; for N2O4(g) ,  Δ\DeltaΔ H°f = 9.66 kJ/mol, S° = 304.3 J/mol·K; assume that Δ\DeltaΔ H° and  Δ\DeltaΔ S° are independent of temperature.]

Accepted Answer

A)  197 °C
B)  56 °C
C)  36 °C
D)  79 °C
E)  476°C F) None of the above
G) C) and D)

Question 4

The heat of vaporization of water is 2.27 kJ/g. What is $\Delta$Svap per mole at the normal boiling point?

Accepted Answer

The answer of The heat of vaporization of water is...

Question 5

$\Delta$Hvap for ethanol is 38.7 kJ/mol at its boiling point (78°C).What is $\Delta$Ssurr when 1.00 mole of ethanol is boiled?

Accepted Answer

The answer of $\Delta$Hvap for ethanol is 38.7 kJ/mol at...

Question 6

For the reaction CuS(s)+ H2(g)  H2S(g)+ Cu(s),
$\Delta$G°f (CuS)= -53.6 kJ/mol
$\Delta$G°f (H2S)= -33.6 kJ/mol
$\Delta$H°f (CuS)= -53.1 kJ/mol
$\Delta$H°f (H2S)= - 20.6 kJ/mol
Will this reaction proceed spontaneously at 298 K and 1 atm pressure?

Accepted Answer

No

Question 7

For the reaction HCONH2(g)  2(g)    NH3(g) + CO(g) , Kc = 4.84 at 400 K. If  \Delta H° for this reaction is 29 kJ/mol, find Kc at 500 K. A) 5.8 B) 0.17 C) 27 D) 0.88 E) 10.3 " class="answers-bank-image d-inline" rel="preload" > NH3(g) + CO(g) , Kc = 4.84 at 400 K. If  Δ\DeltaΔ H° for this reaction is 29 kJ/mol, find Kc at 500 K.

Accepted Answer

A)  5.8
B)  0.17
C)  27
D)  0.88
E)  10.3 F) A) and D)
G) A) and C)

Question 8

For a given substance the entropy always increases in the following order:
S (gas)< S (liq)< S (solid).

Accepted Answer

A) True 
 B)False

Question 9

A sample of solid naphthalene is introduced into an evacuated flask. Use the data below to calculate the equilibrium vapor pressure of naphthalene (C10H8) in the flask at 35°C. 10H8) in the flask at 35°C.   A) 890.mmHg B) 0.21 mmHg C) 696 mmHg D) 0.086 mmHg E) 833 mmHg" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  890.mmHg
B)  0.21 mmHg
C)  696 mmHg
D)  0.086 mmHg
E)  833 mmHgF) D) and E)
G) A) and C)

Question 10

Arrange these reactions according to increasing  Δ\DeltaΔ S. 
1) H2O(g)  →	o→  H2O(l) 
2) 2NO(g)  →	o→  N2(g) + O2(g) 
3) MgCO3(s)  →	o→ MgO(s) + CO2(g)

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  2 
E)  1 < 3 < 2 F) A) and E)
G) B) and C)

Question 11

For the reaction SbCl5(g)  SbCl3(g)+ Cl2(g),
$\Delta$G°f (SbCl5)= -334.34 kJ/mol
$\Delta$G°f (SbCl3)= -301.25 kJ/mol
$\Delta$H°f (SbCl5)= -394.34 kJ/mol
$\Delta$H°f (SbCl3)= -313.80 kJ/mol
Will this reaction proceed spontaneously at 298 K and 1 atm pressure?

Accepted Answer

The answer of For the reaction SbCl5(g)  SbCl3(g)+ Cl2(g),
$\Delta$G°f...

Question 12

Predict the normal boiling point of triethylborane (C6H15B) using the following data: 6H15B) using the following data:   A) 92°C B) -21°C C) 21°C D) 365°C E) 256°C" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  92°C
B)  -21°C
C)  21°C
D)  365°C
E)  256°CF) A) and B)
G) B) and E)

Question 13

Calculate Kp at 298 K for the reaction SO2(g) + NO2(g)  →	o→  SO3(g) + NO(g) . p at 298 K for the reaction SO2(g) + NO2(g)  	o  SO3(g) + NO(g) .   A) 6.99  	imes  10-7 B) 5.71  	imes  10-8 C) 14.2 D) 475 E) 1.42  	imes  106 " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  6.99  ×	imes×  10-7
B)  5.71  ×	imes×  10-8
C)  14.2
D)  475
E)  1.42  ×	imes×  106 F) C) and D)
G) B) and C)

Question 14

Calculate  Δ\DeltaΔ S° for the reaction SO2(s) + NO2(g)  →	o→ SO3(g) + NO(g) . 2(s) + NO2(g)  	o SO3(g) + NO(g) .   A) 53.6 J/K·mol B) -53.6 J/K·mol C) -22.2 J/K·mol D) 474.8 J/K·mol E) -474.8 J/K·mol " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  53.6 J/K·mol
B)  -53.6 J/K·mol
C)  -22.2 J/K·mol
D)  474.8 J/K·mol
E)  -474.8 J/K·mol F) B) and E)
G) B) and D)

Question 15

Using the thermodynamic data provided below, calculate Ka2 for H2CO3(aq)at 25°.

Accepted Answer

4.59 <img  loading="lazy" src="/assets/images/blured-textbook.svg" class="d-inline m-1" alt="blured image" width="139" height="30"> 10<sup>-11</su...

Question 16

Rubidium has a heat of vaporization of 69.0 kJ/mol at its boiling point (686°C).Calculate $\Delta$S for this process, Rb(l)$\to$ Rb(g), at 1 atm and 686°C.

Accepted Answer

The answer of Rubidium has a heat of vaporization of...

Question 17

The entropy change $\times$S° for the reaction NH4Cl(s)$\to$ NH3(g)+ HCl(g)will be negative.

Accepted Answer

A) True 
 B)False

Question 18

The entropy change on vaporization ( Δ\DeltaΔ Svap) of a compound or element is

Accepted Answer

A)  always negative.
B)  always positive.
C)  sometimes is positive and sometimes is negative. D) B) and C)
E) A) and C) B

Question 19

The element oxygen was prepared by Joseph Priestley in 1774 by heating mercury(II) oxide: HgO(s) \9	o\)  Hg(l) + 1/2O2(g) ,  Δ\DeltaΔ H° = 90.84 kJ/mol.
Estimate the temperature at which this reaction will become spontaneous under standard state conditions.
S°(Hg) = 76.02 J/K·mol
S°(O2) = 205.0 J/K·mol
S°(HgO) = 70.29 J/K·mol

Accepted Answer

A)  108 K
B)  430 K
C)  620 K
D)  775 K
E)  840 K F) A) and C)
G) C) and D) E

Question 20

Choose the substance with the higher entropy per mole at a given temperature: 1 mole of N2(g)in a 22.4 L container or 1 mole of N2(g)in a 2.24 L container.

Accepted Answer

1 mole of ...

Exam 18: Entropy, Free Energy, and Equilibrium

Predict the sign of $\Delta$ S for the reaction 6CO₂(g)+ 6H₂O(g) $\to$ C₆H₁₂O₆(g)+ 6O₂(g).

Correct Answer
verified

Aluminum forms a layer of aluminum oxide when exposed to air which protects the bulk metal from further corrosion. 4Al(s) + 3O₂(g) $\to$ 2Al₂O₃(s) Calculate $\Delta$ G° for this reaction, given that $\Delta$ G°_f of aluminum oxide is -1576.4 kJ/mol.

Correct Answer
verified

Correct Answer
verified

The heat of vaporization of water is 2.27 kJ/g. What is $\Delta$ S_vap per mole at the normal boiling point?

Correct Answer
verified

$\Delta$ H_vap for ethanol is 38.7 kJ/mol at its boiling point (78°C).What is $\Delta$ S_surr when 1.00 mole of ethanol is boiled?

Correct Answer
verified

Correct Answer
verified
No

Correct Answer
verified

For a given substance the entropy always increases in the following order: S (gas)< S (liq)< S (solid).

Correct Answer
verified

A sample of solid naphthalene is introduced into an evacuated flask. Use the data below to calculate the equilibrium vapor pressure of naphthalene (C₁₀H₈) in the flask at 35°C.

Correct Answer
verified

Arrange these reactions according to increasing $\Delta$ S. 1) H₂O(g) $\to$ H₂O(l) 2) 2NO(g) $\to$ N₂(g) + O₂(g) 3) MgCO₃(s) $\to$ MgO(s) + CO₂(g)

Correct Answer
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Correct Answer
verified

Predict the normal boiling point of triethylborane (C₆H₁₅B) using the following data:

Correct Answer
verified

Correct Answer
verified

Calculate $\Delta$ S° for the reaction SO₂(s) + NO₂(g) $\to$ SO₃(g) + NO(g) . $Calculate \Delta S° for the reaction SO<sub>2</sub>(s) + NO<sub>2</sub>(g) \to SO<sub>3</sub>(g) + NO(g) . A) 53.6 J/K·mol B) -53.6 J/K·mol C) -22.2 J/K·mol D) 474.8 J/K·mol E) -474.8 J/K·mol$

Correct Answer
verified

Using the thermodynamic data provided below, calculate K_a2 for H₂CO₃(aq)at 25°.

Correct Answer
verified
4.59 10^{-11View Answer}

Rubidium has a heat of vaporization of 69.0 kJ/mol at its boiling point (686°C).Calculate $\Delta$ S for this process, Rb(l) $\to$ Rb(g), at 1 atm and 686°C.

Correct Answer
verified

The entropy change $\times$ S° for the reaction NH₄Cl(s) $\to$ NH₃(g)+ HCl(g)will be negative.

Correct Answer
verified

The entropy change on vaporization ( $\Delta$ S_vap) of a compound or element is

Correct Answer
verified
B

Correct Answer
verified
E

Choose the substance with the higher entropy per mole at a given temperature: 1 mole of N₂(g)in a 22.4 L container or 1 mole of N₂(g)in a 2.24 L container.

Correct Answer
verified
1 mole of ...
View Answer

Exam 18: Entropy, Free Energy, and Equilibrium

Predict the sign of Δ\DeltaΔ S for the reaction 6CO2(g)+ 6H2O(g) →\to→ C6H12O6(g)+ 6O2(g).

Correct AnswerverifiedShow Answer

Aluminum forms a layer of aluminum oxide when exposed to air which protects the bulk metal from further corrosion. 4Al(s) + 3O2(g) →\to→ 2Al2O3(s) Calculate Δ\DeltaΔ G° for this reaction, given that Δ\DeltaΔ G°f of aluminum oxide is -1576.4 kJ/mol.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The heat of vaporization of water is 2.27 kJ/g. What is Δ\DeltaΔ Svap per mole at the normal boiling point?

Correct AnswerverifiedShow Answer

Δ\DeltaΔ Hvap for ethanol is 38.7 kJ/mol at its boiling point (78°C).What is Δ\DeltaΔ Ssurr when 1.00 mole of ethanol is boiled?

Correct AnswerverifiedShow Answer

For the reaction CuS(s)+ H2(g) H2S(g)+ Cu(s), Δ\DeltaΔ G°f (CuS)= -53.6 kJ/mol Δ\DeltaΔ G°f (H2S)= -33.6 kJ/mol Δ\DeltaΔ H°f (CuS)= -53.1 kJ/mol Δ\DeltaΔ H°f (H2S)= - 20.6 kJ/mol Will this reaction proceed spontaneously at 298 K and 1 atm pressure?

Correct AnswerverifiedNo

For the reaction HCONH2(g) NH3(g) + CO(g) , Kc = 4.84 at 400 K. If Δ\DeltaΔ H° for this reaction is 29 kJ/mol, find Kc at 500 K.

Correct AnswerverifiedShow Answer

For a given substance the entropy always increases in the following order: S (gas)< S (liq)< S (solid).

Correct AnswerverifiedShow Answer

A sample of solid naphthalene is introduced into an evacuated flask. Use the data below to calculate the equilibrium vapor pressure of naphthalene (C10H8) in the flask at 35°C.

Correct AnswerverifiedShow Answer

Arrange these reactions according to increasing Δ\DeltaΔ S. 1) H2O(g) →\to→ H2O(l) 2) 2NO(g) →\to→ N2(g) + O2(g) 3) MgCO3(s) →\to→ MgO(s) + CO2(g)

Correct AnswerverifiedShow Answer

For the reaction SbCl5(g) SbCl3(g)+ Cl2(g), Δ\DeltaΔ G°f (SbCl5)= -334.34 kJ/mol Δ\DeltaΔ G°f (SbCl3)= -301.25 kJ/mol Δ\DeltaΔ H°f (SbCl5)= -394.34 kJ/mol Δ\DeltaΔ H°f (SbCl3)= -313.80 kJ/mol Will this reaction proceed spontaneously at 298 K and 1 atm pressure?

Correct AnswerverifiedShow Answer

Predict the normal boiling point of triethylborane (C6H15B) using the following data:

Correct AnswerverifiedShow Answer

Calculate Kp at 298 K for the reaction SO2(g) + NO2(g) →\to→ SO3(g) + NO(g) .

Correct AnswerverifiedShow Answer

Calculate Δ\DeltaΔ S° for the reaction SO2(s) + NO2(g) →\to→ SO3(g) + NO(g) .

Correct AnswerverifiedShow Answer

Using the thermodynamic data provided below, calculate Ka2 for H2CO3(aq)at 25°.

Correct Answerverified4.59 10-11View AnswerShow Answer

Rubidium has a heat of vaporization of 69.0 kJ/mol at its boiling point (686°C).Calculate Δ\DeltaΔ S for this process, Rb(l) →\to→ Rb(g), at 1 atm and 686°C.

Correct AnswerverifiedShow Answer

The entropy change ×\times× S° for the reaction NH4Cl(s) →\to→ NH3(g)+ HCl(g)will be negative.

Correct AnswerverifiedShow Answer

The entropy change on vaporization ( Δ\DeltaΔ Svap) of a compound or element is

Correct AnswerverifiedB

Correct AnswerverifiedE

Choose the substance with the higher entropy per mole at a given temperature: 1 mole of N2(g)in a 22.4 L container or 1 mole of N2(g)in a 2.24 L container.

Correct Answerverified1 mole of ...View AnswerShow Answer

Predict the sign of $\Delta$ S for the reaction 6CO₂(g)+ 6H₂O(g) $\to$ C₆H₁₂O₆(g)+ 6O₂(g).

Correct Answer
verified

Aluminum forms a layer of aluminum oxide when exposed to air which protects the bulk metal from further corrosion. 4Al(s) + 3O₂(g) $\to$ 2Al₂O₃(s) Calculate $\Delta$ G° for this reaction, given that $\Delta$ G°_f of aluminum oxide is -1576.4 kJ/mol.

Correct Answer
verified

Correct Answer
verified

The heat of vaporization of water is 2.27 kJ/g. What is $\Delta$ S_vap per mole at the normal boiling point?

Correct Answer
verified

$\Delta$ H_vap for ethanol is 38.7 kJ/mol at its boiling point (78°C).What is $\Delta$ S_surr when 1.00 mole of ethanol is boiled?

Correct Answer
verified

Correct Answer
verified
No

Correct Answer
verified

Correct Answer
verified

A sample of solid naphthalene is introduced into an evacuated flask. Use the data below to calculate the equilibrium vapor pressure of naphthalene (C₁₀H₈) in the flask at 35°C.

Correct Answer
verified

Arrange these reactions according to increasing $\Delta$ S. 1) H₂O(g) $\to$ H₂O(l) 2) 2NO(g) $\to$ N₂(g) + O₂(g) 3) MgCO₃(s) $\to$ MgO(s) + CO₂(g)

Correct Answer
verified

Correct Answer
verified

Predict the normal boiling point of triethylborane (C₆H₁₅B) using the following data:

Correct Answer
verified

Correct Answer
verified

Calculate $\Delta$ S° for the reaction SO₂(s) + NO₂(g) $\to$ SO₃(g) + NO(g) . $Calculate \Delta S° for the reaction SO<sub>2</sub>(s) + NO<sub>2</sub>(g) \to SO<sub>3</sub>(g) + NO(g) . A) 53.6 J/K·mol B) -53.6 J/K·mol C) -22.2 J/K·mol D) 474.8 J/K·mol E) -474.8 J/K·mol$

Correct Answer
verified

Using the thermodynamic data provided below, calculate K_a2 for H₂CO₃(aq)at 25°.

Correct Answer
verified
4.59 10^{-11View Answer}

Rubidium has a heat of vaporization of 69.0 kJ/mol at its boiling point (686°C).Calculate $\Delta$ S for this process, Rb(l) $\to$ Rb(g), at 1 atm and 686°C.

Correct Answer
verified

The entropy change $\times$ S° for the reaction NH₄Cl(s) $\to$ NH₃(g)+ HCl(g)will be negative.

Correct Answer
verified

The entropy change on vaporization ( $\Delta$ S_vap) of a compound or element is

Correct Answer
verified
B

Correct Answer
verified
E

Choose the substance with the higher entropy per mole at a given temperature: 1 mole of N₂(g)in a 22.4 L container or 1 mole of N₂(g)in a 2.24 L container.

Correct Answer
verified
1 mole of ...
View Answer