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Question

A 5 M aqueous solution of ethanol has a density of 1.025 g/mL. Find its molality

A
5.12 m
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B
6.29 m
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C
6.69 m
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D
4.85 m
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Solution

The correct option is B 6.29 m
5 M ethanol 5 moles (5 mol ×46 g/mol) of solute in 1000 mL solution
Mass of solution =volume ×density
1000×1.025=1025 g
Mass of solvent =1025-(5×46)=795 g
Molality=no. of moles of soluteMass of solvent in kg=5×1000795=6.29 m

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