An aqueous solution of ethanol has
density 1.025 g/mL and it is 2M. What
is the molality of this solution?
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An aqueous solution of ethanol has
density 1.025 g/mL and it is 2M. What
is the molality of this solution?
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Answer:
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 H
2O=1025−92=933g2M 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 H
2O=1025−92=933g
∴ Molality=
Mass of water in kg
Moles of solute=9332×1000=2.143M
Explanation:
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