Berapa persen massa nitrogen pada senyawa senyawa berikut A.NH3 B.NO2 C.NH4Cl D.CO(NH2)2

note : Ar N = 14, H = 1, O = 16
A. 14 / 17 × 100% = 82%
B. 14 / (32 + 14) × 100% = 30%
C. 14 / (18 + 35,5) × 100% = 26%
D. 28 / 60 × 100% = 47 %