Which equation correctly relates the heat of reaction to the standard heats of formation? ∆h° + ∆hf°(products) = ∆hf°(reactants) ∆h° = ∆hf°(products) – ∆hf°(reactants) ∆h° = ∆hf°(products) + ∆hf°(reactants) ∆h° – ∆hf°(reactants) = ∆hf°(products)