Answer
$79\,kJ/mol$
Work Step by Step
We find:
$\Delta G^{\circ}=-RT\ln K_{sp}$
$=-(8.314\,Jmol^{-1}K^{-1})(25+273)K\times(\ln 1.6\times10^{-14})$
$=79000\,J/mol$
$=79\,kJ/mol$
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