Setting up the Keq expression:

$\overline{){\mathbf{Kp}}{\mathbf{=}}{\mathbf{}}\frac{\left[\mathrm{products}\right]}{\left[\mathrm{reactants}\right]}}\phantom{\rule{0ex}{0ex}}\mathbf{4}\mathbf{.}\mathbf{08}\mathbf{x}{\mathbf{10}}^{\mathbf{-}\mathbf{25}}\mathbf{}\mathbf{=}\mathbf{}{({P}_{{H}_{2}O})}^{\mathbf{10}}\phantom{\rule{0ex}{0ex}}{\mathbf{P}}_{{\mathbf{H}}_{\mathbf{2}}\mathbf{O}}\mathbf{}\mathbf{=}\mathbf{}\sqrt[\mathbf{10}]{\mathbf{4}\mathbf{.}\mathbf{08}\mathbf{x}{\mathbf{10}}^{\mathbf{-}\mathbf{25}}\mathbf{}}$

Sodium sulfate 10−hydrate, Na _{2}SO_{4}∙10H_{2}O, dehydrates according to the equation

Na_{2}SO_{4}·10H_{2}O(s) ⇌ Na_{2}SO4(s) + 10H_{2}O(g) K _{P} = 4.08 x 10^{−25} at 25°C

What is the pressure of water vapor at equilibrium with a mixture of Na _{2}SO_{4}∙10H_{2}O and NaSO_{4}?

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