Practice Problems 3 F2011

Practice Problems 3 F2011 - b The number of molecules of...

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CHEMISTRY 1414 Fall 2011 Practice Problem Set 3 1) . The combustion of 1.621 g of a newly synthesized compound, which was known to contain only carbon, hydrogen, and oxygen, produced 1.902 g of water and 3.095 g of carbon dioxide. What is the empirical formula of this compound? 2) . A compound containing xenon and fluorine was obtained by the ultraviolet irradiation of a mixture containing 0.526 g of xenon and fluorine gas. If 0.678 g of the new compound is isolated, what is its empirical formula?
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3) . An organic compound is composed of 63.15 % carbon, 5.30 % hydrogen, and 31.55 % oxygen by mass. The molar mass of this compound is 152.14 g/mol. What is the empirical and molecular formula of this compound? 4) . Sulfur trioxide is an important industrial material used as a precursor for the preparation of sulfuric acid. It is synthesized from sulfur dioxide and oxygen. If an industrial process in a pilot plant generates 8.765 kg of sulfur trioxide, determine: a) . The number of moles of sulfur trioxide produced.
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Unformatted text preview: b) . The number of molecules of sulfur trioxide produced. c) . The number of sulfur atoms AND the number of oxygen atoms present. 5) . A compound found in a human cell was determined to be composed of carbon, hydrogen, oxygen, and nitrogen. A combustion analysis of 1.35 g of this compound resulted in the isolation of 2.20 g of CO 2 and 0.901 g of H 2 O. When a second sample of this compound weighing 0.500 g was analyzed for nitrogen, 0.130 g of N 2 was produced. Determine the empirical formula of this compound. 6) . An industrial by-product produced in Oklahoma and detected in samples of water from the Arkansas River is composed of the elements carbon, hydrogen, oxygen and chlorine. The combustion analysis of 0.100 g of this compound yielded 0.0682 g of CO 2 and 0.0140 g of H 2 O. Analysis of the sample for chlorine content indicated that the mass percent of chlorine in the compound was 55.0 %. What is the empirical AND molecular formula of this compound?...
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Practice Problems 3 F2011 - b The number of molecules of...

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