GKFix MCQ Question

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

• A. ∆rH⁰ = Σ∆fH⁰(reactants) – Σ∆fH⁰(products)
• B. ∆rH⁰ = Σ∆fH⁰(products) – Σ∆fH⁰(reactants)
• C. ∆rH⁰ = Σ bond energies of reactants – Σ bond energies of products
• D. ∆rH⁰ = ∆H + p∆V