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 x 10-4 m

c

33.3 m

d

3.33 x 10-2 m

answer is B.

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Detailed Solution

Molality = Moles of solute  Mass of water (in kg)  Moles of urea =0.01060molMass of water at STPd=1g/cm3=1kg/dm3=0.3dm3=0.3kg∴  Molality =0.01060×0.3=5.55×10−4 molal
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