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Standard heats of formation are _________ for endothermic reaction.

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Standard heats of formation are _________ for endothermic reaction.

(a) Negative

(b) Positive

(c) Zero

(d) None of the mentioned

The question was asked in a job interview.

My question is from Energy Balances for a Chemical Reaction in portion Energy Balances of Chemical Process Calculation

1 Answer

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The correct answer is:

(b) Positive

In an endothermic reaction, heat is absorbed from the surroundings. Since the reaction absorbs energy, the standard heat of formation for the products would be positive, indicating that energy is required to form the product from its elements in their standard states.

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