Calculate the approximate enthalpy change, ΔH rxn, for the combustion of methane:
CH 4 + 2O2 → 2H2O + CO2
ΔH for CH4 = -74.53 kJ/mol
ΔH for O2 = 0 kJ/mol
ΔH for H2O = -241.8 kJ/mol
ΔH for CO2 = -393.5 kJ/mol
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