A reaction can form either product M or product N

CHEMISTRY · Single correct · AP · Chemistry · Thermodynamics and Electrochemistry · Thermodynamics and Electrochemistry

Problem

A reaction can form either product M or product N. • Ea(M)=55 kJ mol−1E_a(\text{M}) = 55\,\text{kJ mol}^{-1}, ΔG∘(M)=−18 kJ mol−1\Delta G^{\circ}(\text{M}) = -18\,\text{kJ mol}^{-1} • Ea(N)=80 kJ mol−1E_a(\text{N}) = 80\,\text{kJ mol}^{-1}, ΔG∘(N)=−35 kJ mol−1\Delta G^{\circ}(\text{N}) = -35\,\text{kJ mol}^{-1} The reaction is run under two different conditions. Trial 1: Reactants are maintained at 25 ∘C25\,^{\circ}\text{C} for 2 min and then quenched. Trial 2: An identical mixture is heated to 200 ∘C200\,^{\circ}\text{C} for 4 h before quenching. Which statement correctly predicts the major product in each trial? (a) Both trials yield mostly M because it has the lower activation energy. (b) Trial 1 yields mostly N, whereas Trial 2 yields mostly M. (c) Trial 1 yields mostly M, whereas Trial 2 yields mostly N. (d) Both trials yield mostly N because it has the more negative ΔG∘\Delta G^{\circ}.

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