GKFix MCQ Question

How is the enthalpy change of a reaction calculated using standard enthalpies of formation?

• A. ∆rH° = Σ∆fH°(reactants) – Σ∆fH°(products)
• B. ∆rH° = Σ∆fH°(products) + Σ∆fH°(reactants)
• C. ∆rH° = Σ∆fH°(products) – Σ∆fH°(reactants)
• D. ∆rH° = Σ bond energies of reactants – Σ bond energies of products