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What is the molality of a solution conta...

What is the molality of a solution containing 200 mg of urea (molar mass `= 60 g mol^(-1)`) ?

A

0.0825

B

0.825

C

0.498

D

0.0014

Text Solution

Verified by Experts

The correct Answer is:
A
No. of moles of urea `= (0.2g)/(("60 g mol"^(-1)))=0.0022` mol
Mass of water in kg `=(40)/(1000)=0.04kg`
Molality of solution `= (("0.0033 mol"))/(("0.04 kg"))`
`= 0.0825 "mol Kg"^(-1)=0.0825`m .
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