A 7294 G Sample of a Compound Was Analyzed for Nitrogen

A 7.294 g sample of a compound was analyzed for nitrogen. In the procedure, all of the nitrogen present was completely converted to ammonia (NH₃) . 3.196 grams of ammonia were obtained. What is the percent, by mass, of nitrogen in the compound?

A) 7.78 %
B) 33.17 %
C) 36.04 %
D) 43.82 %
E) 44.16 %