Pyruvic acid, HC3H3O3, is involved in cell metabolism. It can be assayed for (that is, the amount of it determined) by using a yeast enzyme. The enzyme makes the following reaction go to completion:
HC3H3O3(aq) → C2H4O(aq) + CO2(g)
If a sample containing pyruvic acid gives 21.2 mL of carbon dioxide gas, CO2, at 349 mmHg and 30oC, how many grams of pyruvic acid are there in the sample?