To 350 g of an aqueous solution of ethanol with a mass fraction of 20% was added 140 ml of water. Calculate the mass fraction

To 350 g of an aqueous solution of ethanol with a mass fraction of 20% was added 140 ml of water. Calculate the mass fraction of alcohol in the resulting solution.

ω (X) = m (X) / m (solution)
ω = 350 * 0.2 / (350 + 140) = 0.143 or 14.3%

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