Chemistry

Chemistry

Problem

In the energy profile for a three-step reaction, the enthalpy of the reactants is defined as 0 kJ0\,\text{kJ}. The stable intermediate lies at −15 kJ-15\,\text{kJ}, and the products lie at +25 kJ+25\,\text{kJ}. Which statement best describes the overall enthalpy change, ΔH\Delta H, for the reaction? a) ΔH=−25 kJ\Delta H = -25\,\text{kJ}; the reaction is exothermic b) ΔH=−15 kJ\Delta H = -15\,\text{kJ}; the reaction is exothermic c) ΔH=+25 kJ\Delta H = +25\,\text{kJ}; the reaction is endothermic d) ΔH=+40 kJ\Delta H = +40\,\text{kJ}; the reaction is endothermic

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