Question

how many moles of NH3 can be produced from 3.5 moles of N2

Answer 1

1(N2) + 3(H2) --> 2(NH3)
The number in front of the molecules are the mole number

3.5*1(N2) + 3.5*3(H2) --> 3.5*2(NH3)

3.5(N2) + 10.5(H2) --> 7(NH3)

It would produce 7 miles of NH3