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:

Question

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: (A) 5.55 × 10-4 (B) 33.3 m (C) 3.33 × 10-2 m (D) 0.555 m

Tardigrade Admin · Accepted Answer

Molality = (0.01/ 60/0.3) = (0.01/60 × 0.3) ; d = 1 g/ml 5.55 Ã 10-4 m

Q. The molality of a urea solution in which 0.0100 g of urea, $[(N H_{2})_{2} CO]$ is added to 0.3000 $d m^{3}$ of water at STP is:

$5.55 \times 1 0^{- 4}$

$33.3 m$

$3.33 \times 1 0^{- 2} m$

$0.555 m$

Molality $= \frac{0.01/60}{0.3} = \frac{0.01}{60 \times 0.3}; d = 1 g / m l$
$5.55 \times 1 0^{- 4} m$

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

5.55×10−4

33.3m

3.33×10−2m

0.555m