Answer
$5.1\times10^{-2}$
Work Step by Step
$K_{p} = \frac{(P_{NO})^{2}}{(P_{N_{2}}) (P_{O_{2}})} = \frac{(0.050atm)^{2}}{0.15atm\times 0.33atm} \approx 5.1\times 10^{-2}$
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