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Question

The molality of the 3M solution of methanol if the density of the solution is 0.9 g.cm3 is:

A
3.73
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B
3.0
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C
3.33
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D
3.1
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E
3.2
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Solution

The correct option is A 3.73
3 M solution means 3 moles of methanol in 1L of solution

Since Density =massvolume

Mass of the solution =0.9×1000=900 grams

Mass of solvent =900(3×32)=804 grams

Molality =molesMass of solvent in Kg=30.804=3.73m

m=3.7283.73m

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