The thermodynamic feasibility of a chemical reaction depends on the temperature and the signs of enthalpy change, ΔH\Delta HΔH, and entropy change, ΔS\Delta SΔS.
Which of the following lists the signs of ΔH \Delta H\,ΔH and ΔS \Delta S\,ΔS for a reaction that is feasible at low temperatures but is not feasible at high temperatures?
ΔH=+\Delta H = +ΔH=+, ΔS=+\Delta S = +ΔS=+
ΔH=+\Delta H = +ΔH=+, ΔS=−\Delta S = -ΔS=−
ΔH=−\Delta H = -ΔH=−, ΔS=+\Delta S = +ΔS=+
ΔH=−\Delta H = -ΔH=−, ΔS=−\Delta S = -ΔS=−
