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Q.

Molarity and Molality of a solution of a liquid (molecular weight $= 50$ ) in aqueous solution is 9 and 18 respectively. What is the density of solution?

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a

$0.662 g l c c$

b

$0.95 g l c c$

c

$1 g l c c$

d

$1.05 g l c c$

answer is B.

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Detailed Solution

$m = \frac{M \times 1000}{1000 + d - M \times (moI)}$

$18 = \frac{9 \times 1000}{1000 d - 50 \times 9} \Rightarrow d = 0.95 g / cc$

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