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28 Jun 2020

Suppose that a rxn has ∆H = -28 kJ and ∆S= -60 J/K. At what temperature will it change from spontaneous to non-spontaneous?

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AP Chemistry
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Solve problems involving entropy and Gibbs free energy
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Related questions

For each reaction, calculate ?H?rxn, ?S?rxn, and ?Grxn at 39?C.

Part A

N2O4(g)?2NO2(g)

Express your answer using three significant figures.
?H?rxn = kJ

Part B

N2O4(g)?2NO2(g)

Express your answer using three significant figures.
?S?rxn = J/K

Part C

N2O4(g)?2NO2(g)

Express your answer using two significant figures.
?G?rxn = kJ

Part D

State whether or not the reaction in part A is spontaneous. If the reaction is not spontaneous, would a change in temperature make it spontaneous? If so, should the temperature be raised or lowered from 39?C?

Express your answer using three significant figures.

Express your answer using three significant figures.

The reaction is spontaneous.
The reaction can be made spontaneous by raising the temperature.
The reaction can be made spontaneous by lowering the temperature.
The reaction can not be spontaneous at any temperature.

Part E

NH4Cl(s)?HCl(g)+NH3(g)

Express your answer using three significant figures.
?H?rxn = kJ

Part F

NH4Cl(s)?HCl(g)+NH3(g)

Express your answer using three significant figures.
?S?rxn = J/K

Part G

NH4Cl(s)?HCl(g)+NH3(g)

Express your answer using three significant figures.
?G?rxn = kJ

Part H

State whether or not the reaction in part B is spontaneous. If the reaction is not spontaneous, would a change in temperature make it spontaneous? If so, should the temperature be raised or lowered from 39?C?

State whether or not the reaction in part B is spontaneous. If the reaction is not spontaneous, would a change in temperature make it spontaneous? If so, should the temperature be raised or lowered from 39?

The reaction is spontaneous.
The reaction can be made spontaneous by raising the temperature.
The reaction can be made spontaneous by lowering the temperature.
The reaction can not be spontaneous at any temperature.

Part I

3H2(g)+Fe2O3(s)?2Fe(s)+3H2O(g)

Express your answer using three significant figures.
?H?rxn = kJ

Part J

3H2(g)+Fe2O3(s)?2Fe(s)+3H2O(g)

Express your answer using three significant figures.
?S?rxn = J/K

Part K

3H2(g)+Fe2O3(s)?2Fe(s)+3H2O(g)

Express your answer using three significant figures.
?G?rxn = kJ

Part L

State whether or not the reaction in part C is spontaneous. If the reaction is not spontaneous, would a change in temperature make it spontaneous? If so, should the temperature be raised or lowered from 39?C?

State whether or not the reaction in part C is spontaneous. If the reaction is not spontaneous, would a change in temperature make it spontaneous? If so, should the temperature be raised or lowered from 39?

The reaction is spontaneous.
The reaction can be made spontaneous by raising the temperature.
The reaction can be made spontaneous by lowering the temperature.
The reaction can not be spontaneous at any temperature.

Part M

N2(g)+3H2(g)?2NH3(g)

Express your answer using three significant figures.
?H?rxn = kJ

Part N

N2(g)+3H2(g)?2NH3(g)

Express your answer using three significant figures.
?S?rxn = J/K

Part O

N2(g)+3H2(g)?2NH3(g)

Express your answer using three significant figures.
?G?rxn = kJ

Part P

State whether or not the reaction in part D is spontaneous. If the reaction is not spontaneous, would a change in temperature make it spontaneous? If so, should the temperature be raised or lowered from 39?C?

State whether or not the reaction in part D is spontaneous. If the reaction is not spontaneous, would a change in temperature make it spontaneous? If so, should the temperature be raised or lowered from 39?

The reaction is spontaneous.
The reaction can be made spontaneous by raising the temperature.
The reaction can be made spontaneous by lowering the temperature.
The reaction can not be spontaneous at any temperature.
For each of the following reactions, calculate ΔH rxn, ΔS rxn, and ΔG rxn at 25C.

Part I
3H2(g) + Fe2O3(s) --> 2Fe(s) + 3H2O(g)

ΔH rxn

Part J
ΔS rxn

Part K
ΔG rxn

Part L
State whether or not the reaction in part I is spontaneous. If the reaction is not spontaneous, would a change in temperature make it spontaneous? If so, should the temperature be raised or lowered from 25C?

Given the values of ?H?rxn, ?S?rxn, and T below, determine ?Suniv. Predict whether or not the reactions will be spontaneous.

a) ?H?rxn= 90 kJ , ?Srxn= 140 J/K , T= 296 K

b) ?H?rxn= 90 kJ , ?Srxn= 140 J/K , T= 760 K

c) ?H?rxn= 90 kJ , ?Srxn=? 140 J/K , T= 296 K

d) ?H?rxn=? 90 kJ , ?Srxn= 140 J/K , T= 409 K

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