Chemistry

Problem

Four chemical equations are listed with their molar enthalpy changes. For which reaction will the surroundings gain thermal energy when exactly one mole of reaction occurs at constant pressure? 1. A:

\Delta H = +75\,\text{kJ mol}^{-1}

2. B:

\Delta H = -40\,\text{kJ mol}^{-1}

3. C:

\Delta H = +120\,\text{kJ mol}^{-1}

4. D:

\Delta H = +15\,\text{kJ mol}^{-1}

a) Reaction C b) Reaction A c) Reaction B d) Reaction D

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