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Q.

The density of 3 M solution of NaCl is 1.0 g mL-1. Molality of the solution is ___________ x 10-2 m (Nearest integer).
Given: Mole mass of Na and Cl is 23 and 35.5 g mol-1 respectively.
 

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answer is 364.

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Detailed Solution

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n = 3 moles 
Weight of solute = 3 x 58.5 = 175.5 g
Weight of solvent = 100 - 175.5 = 824.5 g
m=nW(kg)=3824.5×1000=3.64.

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