Using Hess' Law, calculate the enthalpy of formation for C 3H8(g) using the following thermodynamic data.
C(s) + O2(g) → CO2(g) ΔH = -393.5 kj/mol
H2(g) + 1/2O2(g) → H2O(I) ΔH = -285.8 kj/mol
C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(I) ΔH = 2199.0 kJ/mol
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