A two-step reaction has the following energetic data: • Step 1: , • Step 2: , Which…

CHEMISTRY · Single correct · A Level · Chemistry · Kinetics · Kinetics

Problem

A two-step reaction has the following energetic data: • Step 1: Ea=80 kJ⋅mol−1E_a = 80\,\text{kJ}\cdot\text{mol}^{-1}, ΔH1=+10 kJ⋅mol−1\Delta H_1 = +10\,\text{kJ}\cdot\text{mol}^{-1} • Step 2: Ea=35 kJ⋅mol−1E_a = 35\,\text{kJ}\cdot\text{mol}^{-1}, ΔH2=−70 kJ⋅mol−1\Delta H_2 = -70\,\text{kJ}\cdot\text{mol}^{-1} Which option correctly identifies the rate-determining step and the sign of the overall enthalpy change for the reaction? (a) Step 2 is rate-determining; the overall reaction is exothermic (b) Step 1 is rate-determining; the overall reaction is exothermic (c) Step 1 is rate-determining; the overall reaction is endothermic (d) Step 2 is rate-determining; the overall reaction is endothermic

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