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Dalam 50 gram pupuk urea  terdapat 21 gram nitrogen. Tentukan kadar/kemurnian pupuk tersebut! (Ar N = 14, C = 12, O = 16, H = 1)

Pertanyaan

Dalam 50 gram pupuk urea begin mathsize 14px style left parenthesis C O open parentheses N H subscript 2 close parentheses subscript 2 right parenthesis end style terdapat 21 gram nitrogen. Tentukan kadar/kemurnian pupuk tersebut! (Ar N = 14, C = 12, O = 16, H = 1)

 

Pembahasan Soal:

Berikut adalah tahapan dalam menentukan kadar begin mathsize 14px style left parenthesis C O open parentheses N H subscript 2 close parentheses subscript 2 right parenthesis end style dalam pupuk urea:

  • Penentuan Mr begin mathsize 14px style left parenthesis C O open parentheses N H subscript 2 close parentheses subscript 2 right parenthesis end style

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell Mr space C O open parentheses N H subscript 2 close parentheses subscript 2 end cell equals cell Ar space C plus left parenthesis 2 xAr space N right parenthesis plus left parenthesis 4 x space Ar space H right parenthesis end cell row blank equals cell 12 plus left parenthesis 2 x 14 right parenthesis plus left parenthesis 4 x 1 right parenthesis end cell row blank equals cell 12 plus 28 plus 4 end cell row blank equals cell 44 space g space mol to the power of negative sign 1 end exponent end cell end table end style 

  • Penentuan massa begin mathsize 14px style left parenthesis C O open parentheses N H subscript 2 close parentheses subscript 2 right parenthesis end style

begin mathsize 14px style Massa space N equals fraction numerator Ar space N space x space valensi space N over denominator Mr space C O open parentheses N H subscript 2 close parentheses subscript 2 end fraction x space massa space C O open parentheses N H subscript 2 close parentheses subscript 2 14 space g equals fraction numerator left parenthesis 14 x 2 right parenthesis space g space mol to the power of negative sign 1 end exponent over denominator 60 space g space mol to the power of negative sign 1 end exponent end fraction x space massa space C O open parentheses N H subscript 2 close parentheses subscript 2 massa space C O open parentheses N H subscript 2 close parentheses subscript 2 equals fraction numerator 14 space g space x space 60 space g space mol to the power of negative sign 1 end exponent over denominator 28 space g space mol to the power of negative sign 1 end exponent end fraction massa space space C O open parentheses N H subscript 2 close parentheses subscript 2 equals 30 space g end style   

  • Penentuan kadar

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Jadi dapat disimpulkan kadar begin mathsize 14px style left parenthesis C O open parentheses N H subscript 2 close parentheses subscript 2 right parenthesis end style dalam pupuk urea tersebut adalah 60 %(b/b).

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 13 Maret 2021

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