Endothermic reactions

1 mark · Normal

Which expression is used to calculate the enthalpy change of a reaction per mole?

AΔH = q × nBΔH = q / nCΔH = n / qDΔH = q + n

› Show answer

Correct option: ΔH = q / n

Common mistakes: choosing multiplication rather than division

› Show mark scheme and worked solution

Marking points

B1 · 1 mark · Correct option selected: ΔH = q / n

Worked solution

ΔH = q / n is the correct formula for molar enthalpy change (q = heat energy, n = moles).

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