Jika kandungan senyawa urea, CO(NH2)2, dalam pupuk urea adalah 90%, maka persentase nitrogen dalam pupuk tersebut adalah … (Mr CO(NH2)2 = 60; Ar N = 14)

Jika kandungan senyawa urea, CO(NH2)2, dalam pupuk urea adalah 90%, maka persentase nitrogen dalam pupuk tersebut adalah … (Mr CO(NH2)2 = 60; Ar N = 14)

Jawabannya adalah 42%.

Kadar unsur N dalam senyawa CO(NH₂)₂ dapat dirumuskan :
%N = 2.Ar N/Mr CO(NH₂)₂ X 100%
Sedangkan kadar CO(NH₂)₂ dalam pupuk adalah 90%, maka kadar N dalam pupuk dapat dirumuskan :

%N dalam pupuk = 2.Ar N/ Mr CO(NH₂)₂ X 90%
%N dalam pupuk = 2.14 gr/mol / 60gr/mol X 90%
%N dalam pupuk = 28 gr/mol / 60gr/mol X90%
%N dalam pupuk = 42 %

Jadi, persentase nitrogen dalam pupuk adalah 42%.

Rekomendasi lainnya :

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