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Question

Calculate the molarity of a solution of ethanol in water in which the mole fraction of ethanol is 0.040.
[Take the volume of solution as a volume of water]

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Solution

Let total moles be 1.

Number of moles of ethanol =0.04

Number of moles of water =10.04=0.96

Mass of water =0.96×18=17.3 g17.3 ml [since density of water =1 g/ml]

Hence, Molarity =nV=0.0400.0173=2.31 M

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