Chapter 8.1, Problem 8.1QAP

State the number of atoms of oxygen in the reactants and in the products for each of the following equations:

1. $3N{O}_2\left(g\right)+H_{2}O\left(l\right)\to NO\left(g\right)+2HN{O}_3\left(aq\right)$
2. $5C\left(s\right)+2S{O}_2\left(g\right)\to C{S}_2\left(g\right)+4CO\left(g\right)$
3. $2C_2{H}_2\left(g\right)+5O_2\underset{\to }{\Delta }4C{O}_2\left(g\right)+2H_{2}O\left(g\right)$
4. $N_2{H}_4\left(g\right)+2H_2{O}_2\left(g\right)\to N_2\left(g\right)+4H_{2}O(g$