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Tentukan persentase kadar masing-masing unsur dalam senyawaberikut. c. K 4 ​ [ Fe ( CN ) 6 ​ ]

Tentukan persentase kadar masing-masing unsur dalam senyawa berikut.

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A. Chandra

Master Teacher

Mahasiswa/Alumni Universitas Negeri Jakarta

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Jawaban

% K, % Fe, % C dan % N dalam senyawa berturut-turut adalah 42,39%, 15,22%, 19,57% dan 22,83%.

% K, % Fe, % C dan % N dalam senyawa berturut-turut adalah 42,39%, 15,22%, 19,57% dan 22,83%.

Pembahasan

Diketahui K = 39, Fe = 56, C = 12, N = 14, sehingga nilai : Menentukan persentase kadar masing-masing unsur: Jadi % K, % Fe, % C dan % N dalam senyawa berturut-turut adalah 42,39%, 15,22%, 19,57% dan 22,83%.

Diketahui italic A subscript r K = 39, Fe = 56, C = 12, N = 14, sehingga nilai italic M subscript r space K subscript 4 open square brackets Fe open parentheses C N close parentheses subscript 6 close square brackets:

table attributes columnalign right center left columnspacing 0px end attributes row cell italic M subscript r space K subscript 4 open square brackets Fe open parentheses C N close parentheses subscript 6 close square brackets end cell equals cell left parenthesis 4 cross times italic A subscript r space K right parenthesis plus left parenthesis 1 cross times italic A subscript r space Fe right parenthesis plus left parenthesis 6 cross times italic A subscript r space C right parenthesis plus left parenthesis 6 cross times italic A subscript r space N right parenthesis end cell row blank equals cell left parenthesis 4 cross times 39 right parenthesis plus left parenthesis 1 cross times 56 right parenthesis plus left parenthesis 6 cross times 12 right parenthesis plus left parenthesis 6 cross times 14 right parenthesis end cell row blank equals cell 156 plus 56 plus 72 plus 84 end cell row blank equals cell 368 space g space mol to the power of negative sign 1 end exponent end cell end table 

Menentukan persentase kadar masing-masing unsur:

table attributes columnalign right center left columnspacing 0px end attributes row cell percent sign K end cell equals cell fraction numerator 4 cross times italic A subscript r space K over denominator italic M subscript r space K subscript 4 open square brackets Fe open parentheses C N close parentheses subscript 6 close square brackets end fraction cross times 100 percent sign end cell row blank equals cell fraction numerator 4 cross times 39 over denominator 368 end fraction cross times 100 percent sign end cell row blank equals cell 156 over 368 cross times 100 percent sign end cell row blank equals cell 42 comma 39 percent sign end cell end table  

table attributes columnalign right center left columnspacing 0px end attributes row cell percent sign Fe end cell equals cell fraction numerator 1 cross times Fe over denominator italic M subscript r space K subscript 4 open square brackets Fe open parentheses C N close parentheses subscript 6 close square brackets end fraction cross times 100 percent sign end cell row blank equals cell fraction numerator 1 cross times 56 over denominator 368 end fraction cross times 100 percent sign end cell row blank equals cell 56 over 368 cross times 100 percent sign end cell row blank equals cell 15 comma 22 percent sign end cell end table 

table attributes columnalign right center left columnspacing 0px end attributes row cell percent sign C end cell equals cell fraction numerator 6 cross times italic A subscript r space C over denominator italic M subscript r space K subscript 4 open square brackets Fe open parentheses C N close parentheses subscript 6 close square brackets end fraction cross times 100 percent sign end cell row blank equals cell fraction numerator 6 cross times 12 over denominator 368 end fraction cross times 100 percent sign end cell row blank equals cell 72 over 368 cross times 100 percent sign end cell row blank equals cell 19 comma 57 percent sign end cell end table 

table attributes columnalign right center left columnspacing 0px end attributes row cell percent sign N end cell equals cell fraction numerator 6 cross times italic A subscript r space N over denominator italic M subscript r space K subscript 4 open square brackets Fe open parentheses C N close parentheses subscript 6 close square brackets end fraction cross times 100 percent sign end cell row blank equals cell fraction numerator 6 cross times 14 over denominator 368 end fraction cross times 100 percent sign end cell row blank equals cell 84 over 368 cross times 100 percent sign end cell row blank equals cell 22 comma 83 percent sign end cell end table 

Jadi % K, % Fe, % C dan % N dalam senyawa berturut-turut adalah 42,39%, 15,22%, 19,57% dan 22,83%.

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