Three trials of different reactions are performed in identical calorimeters

CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics

Problem

Three trials of different reactions are performed in identical calorimeters. For each trial the amount of substance that reacts and the molar enthalpy change are given. • Trial I: 1.20 mol1.20\,\text{mol}, ΔH=−110 kJ mol−1\Delta H = -110\,\text{kJ mol}^{-1} • Trial II: 0.50 mol0.50\,\text{mol}, ΔH=−220 kJ mol−1\Delta H = -220\,\text{kJ mol}^{-1} • Trial III: 1.60 mol1.60\,\text{mol}, ΔH=+95 kJ mol−1\Delta H = +95\,\text{kJ mol}^{-1} Which trial involves the largest magnitude of heat transfer ∣q∣|q| between the reaction mixture and the surroundings? (a) Trial II (b) Trial I (c) Trial III (d) Trials I and II tie for the largest

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