Answer:
1: 1, 2, 3
2: 2, 2, 3
3: 2, 1, 2, 1
Step-by-step explanation:
A simple way to do this:
Take an extra page and write your formula at the top, then take your elements (for example in #1, N and H) and write them on the reactants and products sides. On the reactants side write down the numbers you have (N-2, H-2) and the same for the products side (N-1, H-3). Find your GCF's and then you got your answer. It takes a bit of time to figure out HOW to do it but its a good skill to have. I have attached #1 for you.
If you have questions let me know!
Hope that helps