5. EXERCISES Activity 1: Solve Me Direction: Solve the given problems involving Gibbs free Energy & Chemical Equilibrium. Write your answer on a separate sheet of paper. 1. Given the AH° and AS, calculate the AG values for the following reactions and indicate whether the reaction is spontaneous at standard conditions. If a reaction is not spontaneous, state what may be done to make the reaction spontaneous. a. Cigraphite) + 2H2 b. CH3CH3 c. Na + 2H2 • CH0 Ha + C2H4) N2H4 AH° (kJ) -74.9 +137 AS (J/K) +186.3 +121 -331 +50.6

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Chapter1: Chemical Foundations
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5.
EXERCISES
Activity 1: Solve Me
Direction: Solve the given problems involving Gibbs free Energy & Chemical
Equilibrium. Write your answer on a separate sheet of paper.
1. Given the AH° and AS, calculate the AG values for the following reactions and
indicate whether the reaction is spontaneous at standard conditions. If a
reaction is not spontaneous, state what may be done to make the reaction
spontaneous.
a. Cigraphite) + 2H2
b. CH3CH3g)
c. N2u0 + 2H20
+ CH4
Ha + C2H4)
N2H4m
AH° (kJ)
-74.9
+137
+50.6
AS (J/K)
+186.3
+121
-331
2. Calculate AG from standard enthalpy of formation and standard molar
entropy values and predict whether the following reactions is spontaneous or
not, at 25 °C.
А.
H2 + CO2i
H2O + CO
S° (J/mol.K)
130.6
AH (kJ/mol)
CO2
H2Ou
CO
-393.5
-241.8
213.6
188.8
-110.5
197.9
B. Fe2Oa) + 3H2
2Fe +
3H2O
AH (kJ/mol)
S° (J/mol.K)
Fe2031
Ha
Fe
H2O
-822.2
90.0
130.6
27.2
-241.8
188.8
Transcribed Image Text:5. EXERCISES Activity 1: Solve Me Direction: Solve the given problems involving Gibbs free Energy & Chemical Equilibrium. Write your answer on a separate sheet of paper. 1. Given the AH° and AS, calculate the AG values for the following reactions and indicate whether the reaction is spontaneous at standard conditions. If a reaction is not spontaneous, state what may be done to make the reaction spontaneous. a. Cigraphite) + 2H2 b. CH3CH3g) c. N2u0 + 2H20 + CH4 Ha + C2H4) N2H4m AH° (kJ) -74.9 +137 +50.6 AS (J/K) +186.3 +121 -331 2. Calculate AG from standard enthalpy of formation and standard molar entropy values and predict whether the following reactions is spontaneous or not, at 25 °C. А. H2 + CO2i H2O + CO S° (J/mol.K) 130.6 AH (kJ/mol) CO2 H2Ou CO -393.5 -241.8 213.6 188.8 -110.5 197.9 B. Fe2Oa) + 3H2 2Fe + 3H2O AH (kJ/mol) S° (J/mol.K) Fe2031 Ha Fe H2O -822.2 90.0 130.6 27.2 -241.8 188.8
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