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Comment on the spontaneity of a process ...

Comment on the spontaneity of a process when
`DeltaH lt 0, T Delta S gt 0`

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The process is non-spontaneous because `DeltaG` is positive.
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Discuss the effect of temperature on the spontaneity of a process when for the process both DeltaH and DeltaS are positive.

Discuss the effect of temperature on the spontaneity of a process when for the process both DeltaH and DeltaS are negative.

What is the status of a process when (i) Delta G lt 0 (ii) DeltaG = 0 (iii) DeltaG > 0 ? In which of the above cases, the process can be used for obtaining useful work?

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Can DeltaH be regarded as the sole criterion to explain the spontaneity of a process? If no, explain why?

The change in Gibbs free energy of the system along provides a criterion for the spontaneity of a process at constant temperature and pressure. A change in the free energy of a sytem at constant temperature and pressure will be: DeltaG_("system") = DeltaH_("system") - T DeltaS_("system") For a spontaneous reaction DeltaG , equilibrium constant K and E_("cell")^(0) will be respectively:

Free enegry , G = H - TS , is state function that indicates whther a reaction is spontaneous or non-spontaneous. If you think of TS as the part of the system's enegry that is disordered already, then (H -TS) is the part of the system's energy that is still ordered and therefore free to cause spontaneous change by becoming disordered. Also, DeltaG = DeltaH - T DeltaS From the second law of thermodynamics, a reaction is spontaneous if Delta_("total")S is positive, non-spontaneous if Delta_("total")S is negative, and at equilibrium if Delta_('total")S is zero. Since, -T DeltaS = DeltaG and since DeltaG and DeltaS have opposite sings, we can restate the thermodynamic criterion for the spontaneity of a reaction carried out a constant temperature and pressure. IF DeltaG lt 0 , the reaction is spontaneous. If DeltaG gt 0 , the reaction is non-spontaneous. If DeltaG = 0 , the reaction is at equilibrium. Read the above paragraph carefully and answer the following questions based on the above comprehension. For the spontaneity of a reaction, which statement is true?

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