How do I do this? How do I calculate Enthalpy change for reactions? Consider a h

Question

How do I do this? How do I calculate Enthalpy change for reactions?

Consider a hypothetical chemical reaction: A + B rightarrow C + D (In this equation A, B, C and D stand for some unknown chemical formulas.) Here is an energy diagram for the reaction: Use the energy diagram to answer these questions. What is the heat of reaction? Is the reaction exothermic or endothermic? Can you determine the activation energy? Can you determine the activation energy of the reverse reaction? C + D rightarrow A + B

Explanation / Answer

1. Heat of reaction = 200 - 150 = 50 kj/mol

2. Reaction is endothermic because total energy pf products are more than enrergy of reactants.

3. Yes, Activation energy = 250 - 150 = 100 kj/mol

4. Yes, activation energy of reverse reaction = 250 - 200 = 50 kj/mol

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