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Question

Elevation in boiling point of an aqueous glucose solution is 0.6 Kb(water)=0.52K molality1). The mole fraction of glucose in the solution is:

A
0.02
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B
0.03
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C
0.01
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D
0.04
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Solution

The correct option is A 0.02
ΔT=1000×Kb×n×MW×MΔT=1000×Kb×nN×M

ornN=ΔT×M1000×KbnN=0.6×181000×0.52=0.02

Nn=50or1+Nn=51

1+Nn=51
nn+N=0.02
Thus the mole fraction of glucose in the solution is 0.02.

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