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Chemistry Question on Some basic concepts of chemistry

The molality of a urea solution in which 0.0100 g of urea, [(NH2)2CO][(NH_2)_2CO] is added to 0.3000 dm3dm^3 of water at STP is:

A

5.55?10−45.55 ? 10^{-4}

B

33.3 m33.3 \,m

C

3.33?10−2 m3.33 ? 10^{-2}\, m

D

0.555 m0.555\, m

Answer

5.55?10−45.55 ? 10^{-4}

Explanation

Solution

Molality =0.01/600.3=0.0160×0.3;d=1 g/ml= \frac{0.01/ 60}{0.3} = \frac{0.01}{60 \times 0.3}\quad;\quad d = 1 \,g/ml 5.55?10−4 m5.55 ? 10^{-4}\, m