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C142A Worksheet 3 - Chemistry 142A Autumn 2011 Worksheet#3...

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1 Chemistry 142A, Autumn 2011 Worksheet #3 Ch. 3, start of Ch. 4 1) There are several important compounds that contain only nitrogen and oxygen. Calculate the mass percent of nitrogen in each of the following. (Do (b) only.) a) NO, a gas formed by the reaction of N 2 and O 2 in internal combustion engines. b) NO 2 , a brown gas mainly responsible for the brownish color of photochemical smog. c) N 2 O 4 , a colorless liquid used as a fuel in space shuttles. d) N 2 O, a colorless gas used as an anesthetic by dentists (known as laughing gas). 2) Give the empirical formula for each of these compounds. Do(b) only. a) Blue = Nitrogen, Red = Oxygen. b) Black = Carbon, White = Hydrogen. . c) Yellow = Phosphorus, Red = Oxygen. d) Black = Carbon, Red = O, White = H. 3) Terephthalic acid is an important chemical used in the manufacture of polyesters and plasticizers. It contains only C, H, and O. Combustion of 19.81 mg terephthalic acid produces 41.98 mg CO 2 and 6.45 mg H 2 O. If 0.250 mol of terephthalic acid has a mass of 41.5 g, determine the molecular formula for terphthalic acid.
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C142A Worksheet 3 - Chemistry 142A Autumn 2011 Worksheet#3...

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