Question

Calculate the standard free energy of the following reactions
at 25C, using standard free energies of formation.

a. C2H4(g)  3O2(g) ±£ 2CO2(g)  2H2O(l)
b. CaCO3(s)  2H(aq) ±£ Ca2(aq)  H2O(l)  CO2(g)

Answer 1

dHrxn = (n*dHf products) - (n*dHf reactants)