At a certain temperature, the equilibrium constant of the reaction ...

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At a certain temperature, the equilibrium constant of the reaction \( \mathrm{N}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NO}(\mathrm{g}) \) is 0.0004 . Assuming air to be a mixture of four volumes
\( \mathrm{P} \) of nitrogen with one volume of oxygen, the W percentage of nitric oxide by volume, in the gas produced by allowing air to reach equilibrium at this temperature is
(a) \( 3.0 \% \)
(b) \( 0.8 \% \)
(c) \( 0.04 \% \)
(d) \( 8.0 \% \)
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