Use Hess's Law and equations B and C to find the enthalpy change for equation A. A) 2 C2H4 + H2O à C4H9OH ΔH = ??? B) 2 C2H4 + 6 O2 à 4 CO2 + 4 H2O ΔH = -2822.2 kJ C) 4 CO2 + 5 H2O à C4H9OH + 6 O2 ΔH = 1534.7 kJ