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Explain spontaneity of a process in term...

Explain spontaneity of a process in terms of Gibbs energy.

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`triangleG= triangleH-TtriangleS`
`triangleG_("sys")`= negative for spontaneous reactions `(triangleG lt 0)`
`triangleG_("sys")` = positive for non- spontaneous reactions `(triangleG gt 0}`
`triangleG_("sys")` = zero for equilibrium reactions `(triangleG =0)`
`triangleG=-ve, triangleS =+ve, triangleH =-V` are the conditions for the sponaneity of reaction.
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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:

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