Determine AH in kJ for the following reaction using Hess' Law You MUST use Hess' Law to receive any credit for this problem. 3C (graphite) + 4H2(g) C3H8(2) given the following heats of combustion C3Hs()+ 5 O2(g) 3 CO2(g) + 4HO) C(graphite)) + O2(g) CO2(g) H(g) + O2(g) HO) - a. b. C. 2219.9 kJ AH = AH = -393.5 kJ AH = 285.8 kJ