Write the chemical equation for the complete combustion of each fuel. Then find the enthalpy of combustion, ΔHcomb, of each fuel. Express your answers in kJ/mol and kJ/g. Assume that water vapour, rather than liquid water, is formed in both reactions.
CH4 + 2O2 ↔ 2H2O + CO2
2H2 + O2 ↔ 2H2O
how do i go about after this...