Asked by Anonymous

A solution of ethanol (C2H5OH) in water is prepared by dissolving 76.9 mL of ethanol (density 0.79 g/cm^3) in enough water to make .250 L of solution. What is the molarity of ethanol in this solution?
Answered by Dr Russ
Calculate the mass of ethanol (m) used from the volume and the density.

Calculate the RMM for ethanol

Then use m/RMM to calculate the number of moles (M) of ethanol.

I presume the final volume is 0.250 L rather than 250 L.

The molarity is then M/0.250 L

Answered by David
2.24M
Answered by Fai
0.79g/ml x 76.9ml = 60.7g
60.7g /46.06 = 1.3 mole
1.3/ 0.25 L = 5.2M
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