MCQ
For reaction $A{g_2}O(s)\,\, \to \,\,2Ag(s) + (1/2){O_2}(g)$ the value of $\Delta \,H\,\, = \,\,\,30.56\,\,\,kJ\,\,\,mo{l^{ - 1}}$ and $\Delta S = 0.066\,\,kJ{K^{ - 1}}\,mo{l^{ - 1}}$. Temperature at which free energy change for reaction will be zero, is ............. $\mathrm{K}$
  • A
    $373$
  • B
    $413$
  • $463$
  • D
    $493$

Answer

Correct option: C.
$463$
(c) $\Delta G = \Delta H - T\Delta S$

$\Delta G = 0$ at equilibrium

$\therefore \Delta H = T\Delta S$ or $30.56 = T \times 0.066$

$T = 463\,K$.

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