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The molality of a urea solution in which...

The molality of a urea solution in which 0.0100 g of urea, `[(NH_(2))_(2)CO]` is added to `0.3000 dm^(3)` of water at STP is :

A

`5.55xx10^(-4)m`

B

`33.3` m

C

`3.33xx10^(-2)`m

D

0.555 m

Text Solution

Verified by Experts

The correct Answer is:
A
Density of water at `25^(@)C=1`g/mL
Volume of water `=0.3xx1000=300` mL
Mass of water `=300xx1=300g`
Moles of urea `=(0.01)/(60)`
Molality `=(0.01xx1000)/(60xx300)=5.55xx10^(-4)`m
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