Most rum sold in liquor stores is about 30-40% ethanol, C_2H_5OH, by volume. How

Question

Most rum sold in liquor stores is about 30-40% ethanol, C_2H_5OH, by volume. However, overproof rum, which is used to prepare flaming drinks, might contain anywhere between 60-95% alcohol by volume. Calculate the number of moles of ethanol and moles of water in a sample of an overproof rum that is 82% ethanol by volume. Assume that the remainder is water. Which is the solvent, and which is the solute? At 20.0 degree C, the densities of ethanol and water are 0.789 g/mL and 0.998 g/mL, respectively. solute solvent solute solvent

Explanation / Answer

The mixture is 82% by volume of ethanol

volume of water in 100mL = 100-82 = 18 mL

mass of water in 100mixture = 18mL *0.998gm/mL = 17.96 gm

Moles of water = 17.96 gm/18gm/mol = 0.998 moles

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