Calculate the standard Gibbs energy of reaction for 4 HI(g) + O2(g) → 2 I2(s) + 2 H2O(l) at 298 K, using the values of standard entropies and enthalpies of formation given in the Resource section.
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Step 1
Step 1: Identify the given reaction and the substances involved: \[ 4 \text{HI(g)} + \text{O}_2\text{(g)} \rightarrow 2 \text{I}_2\text{(s)} + 2 \text{H}_2\text{O(l)} \] Show more…
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The standard Gibbs energies of formation, $\Delta_{f} G^{\circ},$ for $\mathrm{KO}_{2}(\mathrm{s})$ and $\mathrm{K}_{2} \mathrm{O}(\mathrm{s})$ are $-240.59 \mathrm{kJ} \mathrm{mol}^{-1}$ and $-322.09 \mathrm{kJ}$ $\mathrm{mol}^{-1},$ respectively, at $298 \mathrm{K} .$ Calculate the equilibrium constant for the reaction below at $298 \mathrm{K}$. Is $\mathrm{KO}_{2}(\mathrm{s})$ thermodynamically stable with respect to $\mathrm{K}_{2} \mathrm{O}(\mathrm{s})$ and $\mathrm{O}_{2}(\mathrm{g})$ at $298 \mathrm{K} ?$ $$2 \mathrm{KO}_{2}(\mathrm{s}) \longrightarrow \mathrm{K}_{2} \mathrm{O}(\mathrm{s})+\frac{3}{2} \mathrm{O}_{2}(\mathrm{g})$$.
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