Two reactions are coupled

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

Problem

Two reactions are coupled, sharing an intermediate. Reaction 1: ΔH∘=+60 kJ\Delta H^{\circ}=+60\,\text{kJ}, ΔS∘=+200 J K−1\Delta S^{\circ}=+200\,\text{J}\,\text{K}^{-1} Reaction 2: ΔH∘=−40 kJ\Delta H^{\circ}=-40\,\text{kJ}, ΔS∘=−100 J K−1\Delta S^{\circ}=-100\,\text{J}\,\text{K}^{-1} Assuming the enthalpy and entropy changes are temperature-independent, over which temperature range will the coupled process be spontaneous under standard conditions? (a) T>300 KT>300\,\text{K} (b) T>200 KT>200\,\text{K} (c) T<200 KT<200\,\text{K} (d) At all temperatures

Related theory

Browse the problem library