Well, lets go

Nothing more interesting to say,I did a chemistry test today, so i thought to give you some practices ^ ^
N2(g) + 3 H2(g) → 2 NH3(g).
a. If 6 moles of hydrogen react, how many moles of ammonia can be made?
b. How many moles of nitrogen do you need to make 3.6 moles of ammonia?
c. If you use 4.7 moles of nitrogen, how many moles of hydrogen would you need?

I won't give the answers 'cause they're very eassy to do. Try to do them , and good luck !