Chapter 7.7, Problem 7.56PP

Ammonia is produced by the chemical reaction of hydrogen and nitrogen.
${\text{N}}_{\text{2}}\left(g\right)+{\text{ 3H}}_{\text{2}}\left(g\right)\to \underset{\text{Ammonia}}{{\text{2NH}}_{\text{3}}\left(\text{g}\right)}$

a. How many moles of ${\text{H}}_{\text{2}}$ are needed to react with 1.8 moles of ${\text{N}}_{\text{2}}$ ?
b. How many moles of ${\text{N}}_{\text{2}}$ reacted if 0.60 mole of ${\text{NH}}_{\text{3}}$ is produced?
c. How many moles of ${\text{NH}}_{\text{3}}$ are produced when 1.4 moles of ${\text{H}}_{\text{2}}$ reacts?