GKFix MCQ Question

How is the standard reaction enthalpy (∆rH⁰) calculated using standard enthalpies of formation?

• A. ∆rH⁰ = Σ∆fH⁰(reactants) + Σ∆fH⁰(products)
• B. ∆rH⁰ = Σ∆fH⁰(products) + Σ∆fH⁰(reactants)
• C. ∆rH⁰ = Σaᵢ∆fH⁰(products) – Σbᵢ∆fH⁰(reactants)
• D. ∆rH⁰ = Σ∆fH⁰(reactants) – Σ∆fH⁰(products)