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