First slide

Hess law of constant summation

Question

If S⁰ of Al, Cl₂ and AlCl₃ respectively are 28.3, 223 and 110 J/mol/K ΔS⁰ for 2Al + 3Cl₂ → 2AlCl₃ [in J/K]

Easy

Solution

2Al + 3Cl₂ → 2AlCl₃ , ΔS⁰=?
$\begin{array}{l} \Delta {S^0} = 2S_{AlC{l_3}}^0 - [2S_{Al}^0 + 3S_{C{l_2}}^0]\\ \,\,\,\,\,\,\,\,\,\, = (2 \times 110) - [2(28.3) + 3(223)]\\ \,\,\,\,\,\,\,\,\,\, = 220 - [56.6 + 669] = - 505.6J/K \end{array}$

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