Which mathematical expression represents the heat of reaction for a chemical change?

NY Regents Chemistry Exam August 2023 Question 21

21 Which mathematical expression represents the heat of reaction for a chemical change?

(1) (PE of the products) - (PE of the reactants)

(2) (PE of the products) + (PE of the reactants)

(3) (PE of the products) / (PE of the reactants)

(4) (PE of the products) * (PE of the reactants)

Solution: To calculate the heat of reaction we need to subtract the potential energy of reactants from the potential energy of reactants. Choice 1

Past Exams: HERE

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