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Larutan 3 gram glukosa (Mr air = 180) dalam 250 mL...

Larutan 3 gram glukosa (Mr air = 180) dalam 250 mL air isotonic dengan larutan 4,6 gram X dalam 500 mL air. Berapakah massa molekul relatif zat X?undefined 

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  2. ...undefined 

Jawaban:

Larutan isotonic adalah larutan yang memiliki tekanan osmotik sama. Sehingga:
 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell pi subscript 1 end cell equals cell pi subscript 2 end cell row cell M subscript 1 R subscript 1 T subscript 1 end cell equals cell M subscript 2 R subscript 2 T subscript 2 end cell end table end style


Jika begin mathsize 14px style T subscript 1 double bond T subscript 2 space maka space M subscript 1 double bond M subscript 2 end style, maka:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell M subscript 1 end cell equals cell M subscript 2 end cell row cell n subscript 1 over V subscript 1 end cell equals cell n subscript 2 over V subscript 2 end cell row cell fraction numerator begin display style m subscript 1 over Mr subscript 1 end style over denominator V subscript 1 end fraction end cell equals cell fraction numerator begin display style m subscript 2 over Mr subscript 2 end style over denominator V subscript 2 end fraction end cell row cell fraction numerator begin display style 3 over 180 end style over denominator 250 end fraction end cell equals cell fraction numerator begin display style fraction numerator 4 comma 6 over denominator Mr subscript 2 end fraction end style over denominator 500 end fraction end cell row cell 250 cross times fraction numerator 4 comma 6 over denominator Mr subscript 2 end fraction end cell equals cell 500 cross times 3 over 180 end cell row cell 1150 over Mr subscript 2 end cell equals cell 1500 over 180 end cell row cell 1500 cross times Mr subscript 2 end cell equals cell 1150 cross times 180 end cell row cell Mr subscript 2 end cell equals cell fraction numerator 1150 cross times 180 over denominator 1500 end fraction end cell row blank equals 138 end table end style 
 

Berdasarkan perhitungan tersebut, maka massa molekul relatif zat X adalah 138.

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