ThermodynamicsHard

Question

Which of the following processes are expected to be spontaneous at low temperature and nonspontaneous at high temperature?

Options

A.Dissociation of PCl5(g) into PCl3(g) and Cl2(g).
B.Formation of H2O(l) from H2(g) and O2(g).
C.Formation of H2O(g) from H2(g) and O2(g).
D.Freezing of water.

Solution

For a process to be spontaneous at low temperature and non-spontaneous at high temperature, ΔH = negative and ΔS = negative.

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