If a wine glass contains about 125 cm3, what volume of ethanol will be present in this much wine?
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The answer to this question depends on the alcoholic content of the wine in question. "Good" wines have an alcohol content of around 10 -13 % with 12% being the average. Fortified wines, like what kids used to call MD 20/20, contains 20% alcohol. The yeast that use alcoholic fermentation to produce the ethanol in the wine cannot exist in an environment containing more than 12-13% ethanol and therefore would die before reaching a concentration greater than their limit. Greater concentration requires distillation of fortification. Anyway, if the wine is 12% alcohol then there is (0.12 x volume of wine) of alcohol it it. (0.12 x 125 cc = 15 cc of alcohol).