Problem- Calculate the standard free energy of the following reactions at 25 C using standard free energies of formation
a) C2H4 (g) + 3O2 (g) ---> 2CO2 (g) + 2H2O (g)
b) CaCo3 (s) + 2H+ (aq) ---> Ca+2 (aq) + H2O (l) + CO2 (g)
As much detail as probable is really appreciated