GKFix MCQ Question

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

• A. ∆rH = Σ (aiHi)reactants – Σ (biHi)products
• B. ∆rH = Σ (aiHi)products + Σ (biHi)reactants
• C. ∆rH = Σ (aiHi)products – Σ (biHi)reactants
• D. ∆rH = Σ (aiHi)products × Σ (biHi)reactants