How much ammonia (nh3) is produced from two moles of nitrogen gas? 3h2 + n2 --> 2nh3?

The balanced equation for the reaction for the formation of ammonia is as follows
N₂ + 3H₂ ---> 2NH₃
stoichiometry of N₂ to NH₃ is 1:2
number of moles of N₂ reacted - 2 mol 
if 1 mol of N₂ reacts and forms 2 mol of NH₃
then when 2 mol of N₂ reacts it forms - 2 x 2 = 4 mol of NH₃
number of moles of NH₃ formed - 4 mol 
mass of NH₃ formed - 4 mol x 17 g/mol = 68 g