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(i) Spontaneity of a process can be dete...

(i) Spontaneity of a process can be determined from the entropy change and also from the Gibbs free energy change. But the Gibbs free energy change in more useful than entropy change to determine the spontaneity of a process. Explain it.
(ii) Show that Gibbs energy change of a system at certain temperature and pressure, `DeltaG=DeltaH-TDeltaS`.

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