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Question

A solution containing 10g per dm3 of urea (molecular mass = 60g mol1) is isotonic with a 5% solution of a non- volatile solute. The molecular mass of this non-volatile solute is:

A
250gmol1
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B
300gmol1
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C
350gmol1
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D
200gmol1
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Solution

The correct option is A 300gmol1
10 g per dm3 of urea is isotonic with 5% solution of a non-volatile solute. Hence, their molar concentrations are, equal to each other.
Molar concentration of urea
=10g/dm3murea=10g/dm3m60=16M
Molar concentration of 5% non-volatile solute.
=50g/dm3m(nonvolatilesolute)=50mM
16=50m
or m=50×6=300gmol1

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