Question

How would you balance this equation?
NO+O2=NO2

Answer 1

General procedure :
1- Balance metals
2- Balance non-metals, NOT including O or H
3 - Balance O
4- Balance H

Try following those steps

Answer 2

2NO+O2=2NO2

Answer 3

N: 1 N:1
O:3 O:2

Answer 4

NO+O2=2NO2
N:1 N:2
O:3 O:4
2NO+O2=2NO2
N:2 N:2
O:4 O:4
Just count the atoms and multiply to balance both sides