GKFix MCQ Question

How is the enthalpy change of a reaction mathematically defined?

• A. ∆rH = Σ reactants – Σ products
• B. ∆rH = Σ (enthalpies of products) – Σ (enthalpies of reactants)
• C. ∆rH = qp + w
• D. ∆rH = ∆U + P∆V