Chapter 8.1, Problem 8.2QAP

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

1. $C{H}_4\left(g\right)+2O_2\left(g\right)\underset{\to }{\Delta }C{O}_2\left(g\right)+2H_{2}O\left(g\right)$
2. $4P\left(s\right)+5O_2\left(g\right)\to P_4{O}_{10}\left(s\right)$
3. $4N{H}_3\left(g\right)+6NO\left(g\right)\to 5N_2\left(g\right)+6H_{2}O\left(g\right)$
4. $6C{O}_2\left(g\right)+6H_{2}O\left(l\right)\to C_6{H}_{12}{O}_6\left(aq\right)+6O_2\left(g\right)$
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