Sr please solve  the problem  no. 39

Asked by misra.dinesh2706 | 4th Jan, 2019, 12:54: PM

Expert Answer:

Given:
 
Total pressure PTot = 788 torr
 
Vapour pressure of water P= 648 torr
 
Pressure of liquid = PTot  - P
 
                          = 748 -648
 
                          = 100 torr 
 
Weight =1.25 g
 
 
We space have comma

straight m subscript straight L over straight m subscript straight W space equals space fraction numerator 1.27 over denominator 1 end fraction

We space know comma

straight m subscript straight L over straight m subscript straight W space equals fraction numerator straight P subscript straight L straight M subscript straight L over denominator space straight P subscript straight W straight M subscript straight w end fraction


fraction numerator 1.27 over denominator 1 end fraction equals space fraction numerator 100 cross times straight M subscript straight L over denominator 648 cross times 18 end fraction

straight M subscript straight L space equals space fraction numerator 1.25 over denominator 1 end fraction cross times fraction numerator 648 cross times 18 over denominator 100 end fraction

space space space space space space equals space 145.8 space straight g divided by mol
 
Molar mass of liquid is 145.8 g/mol.
 
Option C is correct.

Answered by Varsha | 4th Jan, 2019, 03:34: PM

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