Home Chemistry Thermodynamics and Thermochemistry Heat of Reaction The heat of formation is the change in entha…
Chemistry Thermodynamics and Thermochemistry Heat of Reaction Single Correct MCQ
Published on: August 13, 2026

The heat of formation is the change in enthalpy accompanying the formation of a substance from its elements at 298 K and 1 atm pressure. Since the enthalpies of elements are taken to be zero, the heat of formation of compounds

A
Is always negative
B
Is always positive
C
May be negative or positive
D
Is zero

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The correct answer is:
C
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