We’re being asked to determine the standard enthalpy change (ΔH˚rxn) for the balanced reaction:
CH4 + 2O2⇌ 2H2O + CO2
Recall that ΔH˚rxn can be calculated from the enthalpy of formation (ΔH˚f) of the reactants and products involved:
Calculate the approximate enthalpy change, ΔH°, for the combustion of methane:
CH4 + 2O2 ⇌ 2H2O + CO2
Use the values you calculated in Parts A to D, keeping in mind the stoichiometric coefficients.
Express your answer to three significant figures and include the appropriate units.
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