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7. Dry air is about 20.95% oxygen by volume. Assuming STP, how many oxygen molecules are
in a 63.0 Liter sample of air?


8. 150 grams of a hydrocarbon contains 125.4 grams carbon and the rest hydrogen. It has a
gram formula mass of 86.2 g/mol.
a. Determine the empirical formula of the compound
b. Determine the molecular formula of the compound


9. Hessite is a mineral form of silver telluride having the chemical formula of Ag2Te.
a. How many grams of silver can be extracted from 1.85 kg of Ag2Te? 1 kg = 1,000 grams
b. How many atoms of silver can be extracted?
c. b. If the current price of silver is $0.80 per gram, what is the total value, in dollars, of silver
extracted from 1.85 kg of Hessite?

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