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A solution of ethanol (d=0.795 g/mL) and water (H2O) is prepared by placing 30.0 mL of...

A solution of ethanol (d=0.795 g/mL) and water (H2O) is prepared by placing 30.0 mL of ethanol in a 250.0 mL volumetric flask and diluting with water to the flask etched mark . (a) what is the molarity of the ethanol in this solution? (b) Next, 25.o mL of the solution above is diluted to a final volume of 500.0 mL, what is the new molarity of the diluted solution?

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Answer #1

density of ethanol = 0.795g/ml

volume of ethanol = 30ml

mass of ethanol = volume *density

                          = 30*0.795 = 23.85 gm

molarity = weight of substance*1000/gram molar mass*volume in ml

            = 23.85*1000/46*250 = 2.073 M

M1V1 = M2 V2

2.073*25 = M2*500

M2 = 2.073*25/500 = 0.10365 M

new molarity of ethanol = 0.10365 m

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