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The formula of citric acid is C5H4O5, its gram molecular mass is 192.14, and the gram Atomic Mass of oxygen is 15.9994. Therefore, the fraction by mass of oxygen in citric acid is 5(15.9994)/192.14 or 0.4162 and the mass of oxygen in 20.2 units of citric acid is 0.4162(20.2) or 8.41 of the same units, to the justified number of significant digits.

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Q: How many grams of Oxygen are in a 20.2 sample of citric acid?
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