Question: how much is 1/5 vodka?
Answer: These days most bottles are 750 ml, which is close to 1/5 of a gallon. A gallon contains 128 fluid ounces. So a fifth (1/5) or 750ml contains a tad more than 25 oz, or 25 one-ounce shots. Of course, many use 1 ½ ounce for a standard shot which is around 16 shots.