Berapa gram nitrogen (N) terdapat dalam 180 gram pupuk urea (co(nh2)2)

180 gr (NH2)2CO [Urea]
Mr Urea = 60
mol urea = 180/60 = 3 mol
Ar Nitrogen = 14 , jumlah nitrogen 2 , Mr Nitrogen = 28
Gram Nitrogen = Mr Nitrogen . Mol Urea ( mol total)
                         = 28 . 3
                         = 84 gram