Question

A solution containing 0.2563 g Nephthalene (MM->128) in 15 g of CCl4. A boiling point elevation of 0.201°C while a solution of 0.6216 g of unknown solute in the same mass of the solvent gives a boiling point elevation of 0.647°C .Find the molecular mass of unknown solute.
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Answer 1

Answer:

Explanation:

We know that,

K  b  =  

1000×w△T  

b ×W×m  For CCl  

4  K  b =  

1000×0.2563

0.201×50×128 =5.019

K  b is now used in the second part of the problem.

m=  △T  

b×W

1000×K  

b×w  =  0.647×50

1000×5.019×0.6216 =96.44

Answer 2

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