# 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:

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

###### 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.

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Enthalpy of Formation concept. You can view video lessons to learn Enthalpy of Formation. Or if you need more Enthalpy of Formation practice, you can also practice Enthalpy of Formation practice problems.