A man downs two shots (1.5 fluid ounces each) of a liquor that is listed as 72 proof. The density of ethanol is 0.88 ounces per fluid ounce and one ounce is 28.35 grams. How many grams of ethanol did he ingest?

Question

Quizplus · Accepted Answer

Proof is twice the alcohol by volume (ABV) percentage, so 72 proof means 36% ABV. Each shot is 1.5 fluid ounces, so two shots are 3 fluid ounces. The volume of ethanol is 36% of 3 fluid ounces, which is 1.08 fluid ounces. The density of ethanol is 0.88 ounces per fluid ounce, so the weight of ethanol is 1.08 * 0.88 = 0.9504 ounces. Converting to grams: 0.9504 ounces * 28.35 grams/ounce = 26.94 grams, approximately 27 grams.

A Man Downs Two Shots (1