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Gunakan Tabel diatas untuk menentukan titik beku d...

 


Gunakan Tabel diatas untuk menentukan titik beku dan titik didih larutan 6,4 gram naftalena begin mathsize 14px style open parentheses C subscript 10 H subscript 8 close parentheses end style dalam 100 gram benzena. (begin mathsize 14px style italic A subscript r end style begin mathsize 14px style H end style = 1 dan begin mathsize 14px style C end style = 12) 

  1. ... space space 

  2. ... undefined 

Jawaban:

Diketahui:
 

begin mathsize 14px style m subscript C subscript 10 H subscript 8 end subscript equals 6 comma 4 space g italic M subscript r space C subscript 10 H subscript 8 end subscript equals 128 space begin inline style bevelled g over mol end style m subscript benzena equals 100 space g end style 


Jawab:
Titik beku 6,4 g naftalena,


begin mathsize 14px style space space space space space increment T subscript f double bond m middle dot K subscript f T subscript f degree minus sign T subscript f equals m subscript C subscript 10 H subscript 8 end subscript over italic M subscript r space C subscript 10 H subscript 8 end subscript cross times 1000 over m subscript benzena cross times K subscript f 5 comma 45 minus sign T subscript f equals fraction numerator 6 comma 4 over denominator 128 end fraction cross times 1000 over 100 cross times 5 comma 07 5 comma 45 minus sign T subscript f equals 2 comma 54 space space space space space space space space space space T subscript f equals 2 comma 91 space degree C end style 


Titik didih 6,4 g naftalena,


begin mathsize 14px style space space space space space increment T subscript b double bond m middle dot K subscript b T subscript b bond T subscript b degree equals m subscript C subscript 10 H subscript 8 end subscript over italic M subscript r space C subscript 10 H subscript 8 end subscript cross times 1000 over m subscript benzena cross times K subscript b T subscript b minus sign 80 comma 2 equals fraction numerator 6 comma 4 over denominator 128 end fraction cross times 1000 over 100 cross times 2 comma 53 T subscript b minus sign 80 comma 2 equals 1 comma 27 space space space space space space space space space space T subscript b equals 81 comma 47 space degree C end style 


Jadi, titik beku dan titik didih larutan 6,4 g naftalena masing-masing adalah begin mathsize 14px style 2 comma 91 space degree C end style dan begin mathsize 14px style 81 comma 47 space degree C end style

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