Question

explain the criteria of Spontaneity​

Answer 1

Entropy is a universal criteria of spontaneity. This means for any process if (dS)>0, the process is spontaneous. Most of the chemical process take place at constant temperature and pressure. During course of every spontaneous process, Gibb's function decreases.

Criteria for spontaneity in terms of free energy change: (i) If ∆G is negative, the process is spontaneous. (ii) If ∆G is positive, the direct process is non-spontaneous. (iii) If ∆G is zero, the process is in equilibrium.

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Answer 2

Entropy is a universal criteria of spontaneity. This means for any process if (dS)>0, the process is spontaneous. Most of the chemical process take place at constant temperature and pressure. During course of every spontaneous process, Gibb's function decreases.