Gibb’s Free Energy
For the following equations:
a. Determine 𝛥H and state if reactions is Enthalpically Favorable or Disfavorable
b. Determine 𝛥S and state if reactions is Entropically Favorable or Disfavorable
c. Determine 𝛥G at room temperature, T=298K and state if the reaction is exothermic or
endothermic
1.
O2→
N2+
N2
O2
N2O5
2.
𝛥H(kJ/mol)
0
0
11.0
FeO +
O2
FeO
Fe2O3
N2O5
O2→
𝛥H(kJ/mol)
0
-272.0
-824.2
𝛥S(J/mol*K)
191.5
205.0
346.0
Fe2O3
𝛥S(J/mol*K)
205.0
60.7
87.4
C6H12O6 + 6O2(g) → 6CO2(g) + 6H2O(g)
3.
𝛥H(kJ/mol)
0
-393.5
-241.8
-1260.0
O2
CO2
H2O
C6H12O6
4.
C3H8 +
O2
CO2
H2O
C3H8
O2(g) →
CO2(g) +
𝛥H(kJ/mol)
0
-393.5
-241.8
-104.5
𝛥S(J/mol*K)
205.0
213.8
69.95
212.1
H2O(g)
𝛥S(J/mol*K)
205.0
213.8
69.95
269.9
Below are 2 methods for the synthesis of Hydrogen Peroxide. Determine which method
is less energy costly and more likely to be used by the pharmaceutical industry. Please
circle you chosen reaction.
H2 + O2 → H2O2
H2O+ O2 → H2O2
O2
H2
H2O
H2O2
𝛥H(kJ/mol)
0
0
-241.8
-187.8
𝛥S(J/mol*K)
205.0
130.7
69.95
109.6