GKFix MCQ Question

How is the standard enthalpy change for a reaction (∆rH⁰) calculated using formation enthalpies?

• A. ∆fH⁰(reactants) + ∆fH⁰(products)
• B. ∑aᵢ∆fH⁰(products) + ∑bᵢ∆fH⁰(reactants)
• C. ∑aᵢ∆fH⁰(products) – ∑bᵢ∆fH⁰(reactants)
• D. ∆fH⁰(products) – ∆fH⁰(reactants)