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Question

An aqueous solution of ethanol has density 1.025g/mL and it is 2M. What is the molality of this solution?

A
1.79
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B
2.143
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C
1.951
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D
None of these
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Solution

The correct option is A 2.143
2M means 2 moles of ethanol in 1L of solution.
2 moles= 46×2=92g of ethanol
Mass of solution= 1000×1.025=1025g
Mass of H2O=102592=933g
Molality= Moles of soluteMass of water in kg
=2933×1000=2.143M

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