A solution of ethanol (C 2 H 5 OH) in water is prepared by dissolving 75.0 mL of

Question

A solution of ethanol (C2H5OH) in water is prepared by dissolving 75.0 mL of ethanol (density = 0.79 g/cm3) in enough water to make 250.0 mL of solution.  Calculate the molarity of ethanol. A solution of ethanol (C2H5OH) in water is prepared by dissolving 75.0 mL of ethanol (density = 0.79 g/cm3) in enough water to make 250.0 mL of solution.  Calculate the molarity of ethanol. A solution of ethanol (C2H5OH) in water is prepared by dissolving 75.0 mL of ethanol (density = 0.79 g/cm3) in enough water to make 250.0 mL of solution.  Calculate the molarity of ethanol.

Explanation / Answer

1 mL = 1 cm^3
Mass ethanol = 75.0 mL x 0.79 g/mL = 59.25 g

Moles ethanol = 59.25 g/ 46.0694 g/mol =1.2863

M = 1.2863 mol / 0.25 L = 5.145M

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