Jawabanmu

2014-02-16T12:09:09+07:00
Jadi caranya itu....

Mr Nitrogen x massa CO(NH2)2/mr CO(NH2)2 = 21 gram nitrogen
14.2 x massa CO(NH2)2 /60 = 21
28 x massa CO(NH2)2 /60 = 21
28 x massa CO(NH2)2 = 60 x 21
28 x massa CO(NH2)2 = 1260
massa CO(NH2)2 = 1260/28 = 45 gram massa CO(NH2)2

Kadar CO(NH2) dalam pupuk

massa CO(NH2)2 / massa pupuk x 100%
45/60 x 100% = 75%