Chemistry

Chemistry

Problem

A one-step reaction has the following energy values along its reaction coordinate: reactants at 40 kJ40\,\text{kJ}, transition state at 120 kJ120\,\text{kJ}, and products at 10 kJ10\,\text{kJ}. Which statement correctly describes the reaction’s overall energy change ΔE\Delta E and thermodynamic classification? a) ΔE=+30 kJ\Delta E = +30\,\text{kJ}; the reaction is endothermic b) ΔE=−30 kJ\Delta E = -30\,\text{kJ}; the reaction is exothermic c) ΔE=−80 kJ\Delta E = -80\,\text{kJ}; the reaction is exothermic d) ΔE=−30 kJ\Delta E = -30\,\text{kJ}; the reaction is endothermic

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