Reaction A: has

CHEMISTRY · Subjective · A Level · Chemistry · Energetics · Energetics

Problem

Reaction A: C2H4(g)+3 O2(g)→2 CO2(g)+2 H2O(l)\mathrm{C_2H_4(g) + 3\,O_2(g) \to 2\,CO_2(g) + 2\,H_2O(l)} has ΔH=−1410  kJ mol−1\Delta H = -1410\;\text{kJ mol}^{-1}. Reaction B: H2O(l)→H2O(g)\mathrm{H_2O(l) \to H_2O(g)} has ΔH=+44.0  kJ mol−1\Delta H = +44.0\;\text{kJ mol}^{-1}. Identify which reaction is exothermic and which is endothermic, and state which reaction involves the greater magnitude of heat exchange per mole.

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