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Di dalam 50 gram urea  terdapat 21 gram nitrogen. ...

Di dalam 50 gram urea left parenthesis C O open parentheses N H subscript 2 close parentheses subscript 2 right parenthesis terdapat 21 gram nitrogen. Kemurnian kandungan nitrogen dalam pupuk tersebut adalah....% (diketahui A subscript r O = 16, N = 14, C = 12, H = 1)space 

Jawaban:

Hukum Proust menyatakan bahwa perbandingan massa unsur penyusun senyawa selalu tetap maka,

Mr space C O open parentheses N H subscript 2 close parentheses subscript 2 equals left curly bracket left parenthesis 1 cross times A subscript r space C right parenthesis plus left parenthesis 1 cross times A subscript r space O right parenthesis plus left parenthesis 2 cross times A subscript r space N right parenthesis plus left parenthesis 4 cross times A subscript r space H right parenthesis right curly bracket Mr space C O open parentheses N H subscript 2 close parentheses subscript 2 equals left parenthesis 12 space gram space mol to the power of negative sign 1 end exponent right parenthesis plus left parenthesis 16 space gram space mol to the power of negative sign 1 end exponent right parenthesis space plus left parenthesis 2 cross times 14 space gram space mol to the power of negative sign 1 end exponent right parenthesis plus left parenthesis 4 cross times 1 space gram space mol to the power of negative sign 1 end exponent right parenthesis Mr space C O open parentheses N H subscript 2 close parentheses subscript 2 equals space 60 space gram space mol to the power of negative sign 1 end exponent Error converting from MathML to accessible text. 

percent sign N equals fraction numerator massa space nitrogen over denominator massa space C O open parentheses N H subscript 2 close parentheses subscript 2 end fraction cross times 100 percent sign percent sign N equals fraction numerator 21 space gram over denominator 45 space gram end fraction cross times 100 percent sign percent sign N equals 46 comma 67 percent sign 

Jadi kemurnian kandungan nitrogen dalam pupuk adalah 46,67%.space 

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