A compound H2X with molar weight of 80 g is dissolved in a solvent having density of 0.4 g ml–1. Assuming no change in volume upon dissolution, the molality of a 3.2 molar solution is

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A compound H₂X with molar weight of 80 g is dissolved in a solvent having density of 0.4 g ml^–1. Assuming no change in volume upon dissolution, the molality of a 3.2 molar solution is

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Assume volume of solution = 1 litre

number of moles of H2X = 3.2

weight of solvent = 1000 × 0.4 = 400 gm

$m = \frac{3 .2}{400 / 1000} = 8$