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  4. 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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Q. The molality of a urea solution in which 0.0100 g of urea, $[(NH_2)_2CO]$ is added to 0.3000 $dm^3$ of water at STP is:

AIEEEAIEEE 2011Some Basic Concepts of Chemistry

Solution:

Molality $= \frac{0.01/ 60}{0.3} = \frac{0.01}{60 \times 0.3}\quad;\quad d = 1 \,g/ml$
$5.55 × 10^{-4}\, m$