Which region in the following diagram corresponds to the heat of reaction?

Name: Which region in the following diagram corresponds to the heat of reaction?
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Question

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Region B corresponds to the heat of reaction, which represents the difference in energy between the reactants and the products. Region A represents the activation energy, while region C represents the overall energy change of the reaction, including any heat transfer to or from the surroundings.

Which Region in the Following Diagram Corresponds to the Heat