What is the free energy change at 25°C for the reaction below, if ΔGfo(CH4(g) = -50.790 kJ/mol, ΔGfo(C7H14(g)) is 95.887 kJ/mol.

C7H14(g) + 7H2(g) ↔ 7CH4(g)

similar question but gives some different G's

When you can do the one before this you can do this one.