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no 8) one mole at all side.
no 9)one mole at N2 and three mole at H2 to get two mole of NH3.
no 10) four mole of Al and three mole of O2 to get two mole of Al2O3.
no 12) two mole of Na and two mole of H2O to get two mole of NaOH and one mole of H2.
no 13) one mole of H2SO4 and two mole of NaOH to get two mole of H2O.

Alhassan
7) 1, 2, 1
8) 2, 2, 2, 2
9) 1, 3, 2
10) 2, 3, 1
11) 2, 1, 2, 3
12) 2, 2, 2, 1
13) 2, 2, 3

I'm 100% sure that I got number 13 wrong, I will still try to do it if I get it I'll comment it..... the other ones are right

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