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Q.

A solution is made by dissolving ${CaBr}_{2}$ in water (solvent) such that mass fraction of solute and solvent is same in the solution. The molality of solution is :

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a

$5 m$

b

$55.55 m$

c

$2.5 m$

d

$2 m$

answer is D.

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Detailed Solution

M = molar concentration

n = moles of solute

v = liters of solution

$M = \frac{n}{v}$

$W_{{CaBr}_{2}} = W_{H_{2} O} m = \frac{\frac{W}{200}}{W} \times 1000 = 5$

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