a. From a consideration of the following reactions, calculate
Hf for methane, CH4(g).
CO2(g) + 2H2(g) → HCHO(g) + H2O(g);
∆Ho(kJ) = 35
CO2(g) → C(s) + O2(g); ∆Ho(kJ) = 393
HCHO(g) + 2H2(g) → CH4(g) + H2O(g); ∆Ho(kJ) = 201
2H2(g) + O2(g) → 2H2O(g);
∆Ho(kJ) = 484
b. From appropriate entropy data, calculate
∆So for the formation of methane from the elements.
c. Using the information from above, calculate
∆Gof for methane at 25oC.