When 14.0 g of N2 reacts according to the following equation…

When 14.0 g оf N2 reаcts аccоrding tо the following equаtion, the amount of NH3 collected was 11.50 g instead of 17.0 g.  What is the percent yield? N2 (g)  +  3H2 (g)  →  2NH3 (g)