The combustion of methane proceeds according to the chemical equation CH₄ + 2O₂ → CO₂ + 2H₂O. The table above provides the average bond enthalpy for selected bonds. The calculated enthalpy change for the reaction, ∆Hᵣₓₙ, is -802 kJ/mol. Which of the following provides the mathematical procedure to estimate the bond enthalpy per mole of O₂?
A) Divide the enthalpy change by the number of moles of O₂.
B) Multiply the enthalpy change by the number of moles of O₂.
C) Subtract the bond enthalpy of CH₄ from the enthalpy change.
D) Add the bond enthalpies of CO₂ and 2H₂O to the enthalpy change.
