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For exothermic reactions, what is the heat of reaction?

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For exothermic reactions, what is the heat of reaction?

(a) Positive

(b) Negative

(c) Zero

(d) Cannot Say

I have been asked this question in examination.

The query is from Standard Heat (Enthalpy) of Formation topic in section Application of Energy Balances in the Absence of Chemical Reactions and Energy Balances: How to Account for Chemical Reaction of Basic Chemical Engineering

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The correct answer is (b) Negative

The explanation: In exothermic reactions, heat leaves the system, so the heat of reaction is negative.

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