Delta G in the process of melting of ice at - | vedclass

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(B) The melting of ice is a phase transition process represented as $H_2O(s) \rightleftharpoons H_2O(l)$.For any process,the Gibbs free energy change

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$\Delta G = +ve$

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(B) The melting of ice is a phase transition process represented as $H_2O(s) \rightleftharpoons H_2O(l)$.For any process,the Gibbs free energy change is given by $\Delta G = \Delta H - T\Delta S$.At temperatures below the melting point ($0\,^{\circ}C$ or $273.15\,K$),the process of melting is non-spontaneous.At $-15\,^{\circ}C$ $(258.15\,K)$,the ice is stable and does not melt spontaneously.Since the process is non-spontaneous at this temperature,$\Delta G$ must be positive $(\Delta G > 0)$.

	$\Delta_r H^{\circ}$	$\Delta_r S^{\circ}$	$\Delta_r G^{\circ}$	Spontaneity of the reaction
$A$	$+$	$+$	$+$	Spontaneous at low $T$
$B$	$+$	$+$	$-$	Spontaneous at high $T$
$C$	$-$	$-$	$-$	Spontaneous at low $T$
$D$	$+$	$-$	$+$	Spontaneous at high $T$

$\Delta G$ in the process of melting of ice at $-15\,^{\circ}C$ is

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