tentukan kadar unsur penyusun senyawa CO(NH2)2

Ar C = 12, Ar O = 16, Ar N = 14, Ar H = 1.

Mr CO(NH2)2 = 60

%C = 12/60 × 100% = 20%
%O = 16/60 × 100% = 26,7%
%N = 28/60 × 100% = 46,7%
%H = 4/60 × 100% = 6,6%