Considering entropy (S) as a thermodynamic parameter, the criterion for the spontaneity of any process is:

Considering entropy (S) as a thermodynamic parameter, the criterion for the spontaneity of any process is:
  1. $\Delta \mathrm{S}_{\text {system }}+\Delta \mathrm{S}_{\text {surrounding }} > 0$
  2. $\Delta \mathrm{S}_{\text {system }}-\Delta \mathrm{S}_{\text {surrounding }} > 0$
  3. $\Delta \mathrm{S}_{\text {System }} > 0$ only
  4. $\Delta \mathrm{S}_{\text {Surroundings }} > $ only

Solution

According to Second Law of Thermodynamics, for a spontaneous process, total change in entropy (system + surrounding) should be positive. \(\Delta \mathrm{S}_{\text {total }}=\Delta \mathrm{S}_{\text {system }}+\Delta \mathrm{S}_{\text {surroundings }} > 0\) Related Theory (Ref. to Fig. ) For the latter two cases, the temperature at which the spontaneity changes will be determined by the relative magnitudes of $\triangle S$ and $\Delta H$.

Asked in: NEET 2004

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