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Problem 87

Ethene $\left(\mathrm{C}_{2} \mathrm{H}_{4}\right…

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Problem 86

Nitrogen dioxide, a pollutant in the atmosphere, can combine with water to form nitric acid. One of the possible reactions is shown here. Calculate $\Delta G^{\circ}$ and $K_{p}$ for this reaction at $25^{\circ} \mathrm{C}$ and comment on the spontaneity of the reaction.
$$3 \mathrm{NO}_{2}(g)+\mathrm{H}_{2} \mathrm{O}(l) \longrightarrow 2 \mathrm{HNO}_{3}(a q)+\mathrm{NO}(g)$$

Answer

$\Delta G^{\circ}=-51.0 \mathrm{kJ}, K_{p}=8.6 \times 10^{8},$ and spontaneous


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