Jacob N. answered 06/16/21
25 years of experience teaching high school chemistry!
Here is how this problem can be solved:
(0.724 mol N2) X (2 mol NH3 / 1 mol N2) = 1.45 mol NH3
(2.88 mol H2) X (2 mol NH3 / 3 mol H2) = 1.92 mol NH3
Of the two possible answers, choose the smaller...1.45 mol.