First slide

Gibb's Helmholtz equation

Question

ΔH⁰ and ΔS⁰ for P_4(s)+5O_2(g) → P₄O_10(s) respectively are – 2984 KJ and – 838J. ΔG⁰ value is (in kilo joules) nearly

Moderate

Solution

$\begin{array}{l} \Delta {G^0} = \Delta {H^0} - T\Delta {S^0}\\ \,\,\,\,\,\,\,\,\,\, = - 2984 - [298( - 0.838)]\\ \,\,\,\,\,\,\,\,\,\,\,\, = - 2984 + 249.8 = - 2734.2 KJ\end{array}$

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