Q.

The molality of a urea solution in which 0.0100 g of urea, [(NH2)2CO] is added to 0.3000 dm3 of water at STP is

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a

0.555 m

b

5.55×10-4m

c

33.3 m

d

3.33×10-2m

answer is B.

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Detailed Solution

Molality =Mass of moles of ureaMass of solventin ml×1000Moles of urea =0.601060molWater at STP (d=1g/cm3=1kg/dm3)=0.3dm3=0.3kg∴ Molality =0.01060×0.3=5.55×10-4m
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