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Question

A certain non-volatile electrolyte contains 40% carbon , 6.7% hydrogen and 53.3% oxygen . An aqueous solution containing 5% by mass of the solute boils at 100.15C. Determine the molecular formula of the compound (Kb=0.5C/m):

A
HCHO
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B
CH3OH
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C
C2H5OH
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D
C6H12O6
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Solution

The correct option is D C6H12O6
(d) Mole ration of C:H:O is 1:2:1 so empirical formula is CH2O
m=ΔTbKb0.150.510.294;
0.294=50M×1000950;M180
(CH2O)n=180 or 30×n=180 or n=6;
molecular formula is C6H12O6.

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