Answer
(a) 514 kJ
(b) -1295 kJ
(c) 34.9 kJ
Work Step by Step
We find:
$\Delta G^{\circ}=\Delta H^{\circ}-T\Delta S^{\circ}$
$T= (273.15+45)K=318.15\,K$
(a) $\Delta G^{\circ}=(293000\,J)-(318.15\,K)(-695\,J/K)$
$=514000\,J=514\,kJ$
(b) $\Delta G^{\circ}=(-1137\,kJ)-(318.15\,K)(0.496\,kJ/K)$
$=-1295\,kJ$
(c) $\Delta G^{\circ}=(-86600\,J)-(318.15\,K)(-382\,J/K)$
$=34900\,J=34.9\,kJ$
