Hydrogen gas, h2, reacts with nitrogen gas, n2, to form ammonia gas, nh3, according to the equation

3h2(g)+n2(g)→2nh3(g)

a. how many moles of nh3 can be produced from 18.0 mol of h2 and excess n2?
b. how many grams of nh3 can be produced from 3.46 mol of n2 and excess h2.
c. how many grams of h2 are needed to produce 13.36 g of nh3?
d. how many molecules (not moles) of nh3 are produced from 1.49×10−4 g of h2?