GKFix MCQ Question

What is the correct formula for calculating the standard enthalpy change of a reaction?

• A. ∆rH° = Σ ai∆fH°(reactants) + Σ bi∆fH°(products)
• B. ∆rH° = Σ ai∆fH°(reactants) – Σ bi∆fH°(products)
• C. ∆rH° = Σ ai∆fH°(products) + Σ bi∆fH°(reactants)
• D. ∆rH° = Σ ai∆fH°(products) – Σ bi∆fH°(reactants)