Answer
Please see the work below.
Work Step by Step
We know that
$K_c=0.0025=\frac{[NO]^2}{[N_2][O_2]}$
This can be rearranged as
$[NO]=[(0.0025)[N_2][O_2]]^{\frac{1}{2}}$
$[NO]=1.33\times 10^{-3}M$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.