Chemistry

Chemistry

Problem

Four separate unimolecular reactions are studied at 298 K. Their activation energies and standard free-energy changes are listed. 1. Ea=110 kJ mol−1E_a = 110\,\text{kJ\,mol}^{-1}, ΔG∘=−50 kJ mol−1\Delta G^{\circ} = -50\,\text{kJ\,mol}^{-1} 2. Ea=45 kJ mol−1E_a = 45\,\text{kJ\,mol}^{-1}, ΔG∘=+5 kJ mol−1\Delta G^{\circ} = +5\,\text{kJ\,mol}^{-1} 3. Ea=90 kJ mol−1E_a = 90\,\text{kJ\,mol}^{-1}, ΔG∘=−5 kJ mol−1\Delta G^{\circ} = -5\,\text{kJ\,mol}^{-1} 4. Ea=20 kJ mol−1E_a = 20\,\text{kJ\,mol}^{-1}, ΔG∘=−1 kJ mol−1\Delta G^{\circ} = -1\,\text{kJ\,mol}^{-1} Which reaction is most likely to be classified as being under kinetic control at this temperature? a) Reaction 4 b) Reaction 2 c) Reaction 1 d) Reaction 3

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