GKFix MCQ Question

How is the enthalpy change for a chemical reaction calculated?

• A. Σ bond enthalpies of products – Σ bond enthalpies of reactants
• B. Σ bond enthalpies of reactants – Σ bond enthalpies of products
• C. Σ bond enthalpies of reactants + Σ bond enthalpies of products
• D. Σ bond enthalpies of products × Σ bond enthalpies of reactants