Problem: Consider the combustion of a single molecule of CH4(g) forming H2O(l) as a product. A typical X-ray photon has an energy of 8 keV. Is the energy released by the combustion of a CH4 molecule larger or smaller than the energy of an X-ray from this source?

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Combustion reaction:   CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(l)

ΔH°rxn=ΔH°f, prod-ΔH°f, react


1 eV = 1.602x10-19 J

1 keV = 10-3 eV

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Problem Details

Consider the combustion of a single molecule of CH4(g) forming H2O(l) as a product. A typical X-ray photon has an energy of 8 keV. Is the energy released by the combustion of a CH4 molecule larger or smaller than the energy of an X-ray from this source?

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