Solution: Water gas, a commercial fuel, is made by the reaction of hot coke with steam.
C(s) + H2O(g) → CO(g) + H2(g)
When equilibrium is established at 800°C the concentrations of CO, H 2, and H2O are
4.00 x 10-2 , 4.00 x 10-2, and 1.00 x 10-2 mole/liter, respectively. What is the value of ΔG° for this reaction at 800°C?
a) 109 kJ
b) –43.5 kJ
c) 193 kJ
d) 16.3 kJ
e) none of these