# Problem: 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.

###### FREE Expert Solution

We’re being asked to determine the standard enthalpy change (ΔH˚rxn) for the balanced reaction:

CH+ 2O2 2H2O + CO2

Recall that ΔH˚rxn can be calculated from the enthalpy of formation (ΔH˚f) of the reactants and products involved:

$\overline{){\mathbf{∆}}{\mathbf{H}}{{\mathbf{°}}}_{{\mathbf{rxn}}}{\mathbf{=}}{\mathbf{∆}}{\mathbf{H}}{{\mathbf{°}}}_{\mathbf{f}\mathbf{,}\mathbf{products}}{\mathbf{-}}{\mathbf{∆}}{\mathbf{H}}{{\mathbf{°}}}_{\mathbf{f}\mathbf{,}\mathbf{reactants}}}$

88% (382 ratings) ###### Problem Details

Calculate the approximate enthalpy change, ΔH°, for the combustion of methane:

CH+ 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.