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Chemistry- balancing equations

I am doing a chemistry assignment and need some help. Can someone explain to me why the big stoichiometric can't have little numbers in the formula, and why it has to have a big number. I also want to know why the big stoichiometric coefficient number has little numbers at front and not at the end?
big stoichiometric?
Reply 2
I was confused sorry. I dont think I meant big. could you explain why it can't have little numbers, and also why coefficient has little numbers at the front and not the end??

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