If the same atoms appear on both sides, then it's balanced.
In this reaction, there are 4 Oxygens, 2 Carbons, and 2 Nitrogens on each side. So numerically, <em>it's balanced</em>. But I don't know enough chemistry to say whether the reaction is possible.
Explanation:
see the above attachment to solve the question and get the answer.
hope this helps you.
The density would increase because you still have the same amount of weight, but it is just packed more tightly in a smaller object.