(1) Setup an ICE chart

(2) Calculating for the concentration of N_{2}O_{4} and NO_{2}

$\overline{){\mathbf{Kp}}{\mathbf{}}{\mathbf{=}}{\mathbf{}}\frac{\left[\mathrm{products}\right]}{\left[\mathrm{reactants}\right]}}\phantom{\rule{0ex}{0ex}}\mathbf{Kp}\mathbf{}\mathbf{=}\mathbf{}\frac{{\mathbf{\left[}{\mathbf{NO}}_{\mathbf{2}}\mathbf{\right]}}^{\mathbf{2}}}{\left[{N}_{2}{O}_{4}\right]}\phantom{\rule{0ex}{0ex}}\mathbf{0}\mathbf{.}\mathbf{25}\mathbf{=}\frac{{\left(2x\right)}^{2}}{\mathbf{0}\mathbf{.}\mathbf{40}\mathbf{-}\mathbf{x}}\phantom{\rule{0ex}{0ex}}\mathbf{0}\mathbf{.}\mathbf{25}\mathbf{=}\frac{4{x}^{2}}{\mathbf{0}\mathbf{.}\mathbf{40}\mathbf{-}\mathbf{x}}\phantom{\rule{0ex}{0ex}}(0.40-x)\mathbf{0}\mathbf{.}\mathbf{25}\mathbf{}\mathbf{=}\mathbf{}\mathbf{4}{\mathbf{x}}^{\mathbf{2}}\phantom{\rule{0ex}{0ex}}\mathbf{4}{\mathbf{x}}^{\mathbf{2}}\mathbf{}\mathbf{+}\mathbf{0}\mathbf{.}\mathbf{25}\mathbf{x}\mathbf{}\mathbf{-}\mathbf{0}\mathbf{.}\mathbf{10}\mathbf{}\mathbf{=}\mathbf{0}$

For the reaction N_{2}O_{4}(*g*) ⇌ 2NO_{2}(*g*), *K*_{p} = 0.25 at a certain temperature. If 0.040 atm of N_{2}O_{4} is reacted initially, calculate the equilibrium partial pressures of NO _{2}(*g*) and N_{2}O_{4}(*g*).

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Based on our data, we think this problem is relevant for Professor Kucera's class at TCC.

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Our data indicates that this problem or a close variation was asked in Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition. You can also practice Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition practice problems.