Answer
See the answer below.
Work Step by Step
Since T and P are the same $V\propto n$, from stoichiometry:
a) $150\ mL×1/2=75\ mL$ of $O_2$ required.
b) $150\ mL×2/2=150\ mL$ of $NO_3$ formed.
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.