An oxide of nitrogen has a molecular weight of 30. Total number of electrons in one molecule of the compound is x

The chemical formula of nitrogen oxide is ${\left(\mathrm{NO}\right)}_x$.

The molecular weight of ${\left(\mathrm{NO}\right)}_x$, MW=30.

Therefore, the formula of oxide of nitrogen is NO.

There are one nitrogen and one oxygen atom are present in oxide of nitrogen.

No. of electrons present in nitrogen monoxide, NO=7(1)+8(1)=15 electrons.