13. Which of the following statements is(are) true?
(A) In exothermic reactions, the reactants are lower in potential energy than the products.
(B) The heat of reaction and change in enthalpy can always be used interchangeably.
(C) Enthalpy is a state function.
(D) A chemist takes the point of view of the surroundings when determining the sign for work or heat.
(E) At least two of these statements are true.

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