First slide

Chemical Equilibrium

Question

The equilibrium constant K_p for a homogeneous gaseous reaction is 10^-8. The standard Gibbs free energy change $∆ G °$ for the reaction in kilocalories is------

Moderate

Solution

${ΔG}^{⊖} = - 2 .303 RTlog K$
$\begin{array}{l} = - 2 .303 \times 2 \times 298 \log 10^{- 8} \\ = - 2 .303 \times 2 \times 298 \times - 8 cal \\ = 10980 cal = 10 .98 kcal \end{array}$

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