Answer to Question #71222 in General Chemistry for Fiona

Question

Ethanol has a molecular mass of 46 and a density of 0.79 g/mL. A bottle of wine has an alcohol (ethanol) concentration of 12% v/v. What is the molar concentration of ethanol in this bottle? Give your answer to 2 decimal places.

Answer 1

For 1 L of solution:
Volume of ethanol: 1000 ∙ 0.12 = 120 mL
Mass of ethanol: 0.79 ∙ 120 = 94.8 g
Amount of ethanol: 94.8 / 46 = 2.06 mol
So, the concentration of ethanol: 2.06 mol/L = 2.06 M
Answer:
2.06 mol/L = 2.06 M