A solution is 40% ethanol (density = 0.789 g/ml) by volume and 60% water (density = 1.00 g/ml). if ray lewis has 750.0 ml of said liquid, what percentage of the mass is ethanol?

Question

Chemistry

Yair Key

21 January, 10:22

A solution is 40% ethanol (density = 0.789 g/ml) by volume and 60% water (density = 1.00 g/ml). if ray lewis has 750.0 ml of said liquid, what percentage of the mass is ethanol?

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Rodgers · Answer 1

Since the volume of ethanol is 40% of total volume, so V = 40% x 750 = 300 ml

volume of water = 750 - 300 = 450 ml

density of ethanol = m/vol = m/300 = 0.789, m = 236.7 g

mass of water 450 g

percentage of ethanol of total mass is 236.7 / (450 + 236.7) x 100 = 34.5% approx