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12.5% ethanol by volume implies 12.5 mL ethanol 12.5 mL ethanol+87.5 mL water 12.5 mL ethanol x 0.789 g/mL = 9.8625 g ethanol 9.8625 g / 46.068 g/mol = 0.2140857 mol ethanol 87.5 mL water x 1.00 g/mL = 87.5 g water 87.5 g water = 0.0875 kg water molality =
