In Class Problems 3

In Class Problems 3 - If 1.250 g of bromine is reacted with...

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CHEMISTRY 1414 Spring 2011 In Class Problem Set 3 1) . A sample of oxalic acid, which as the molecular formula H 2 C 2 O 4 , has a mass of 16.5 g. Determine the following quantities: a) . The number of moles of oxalic acid. b) . The number of grams of hydrogen, carbon, and oxygen in the sample. c) . The percent mass of each element present. d) . The number of molecules of oxalic acid in the sample. e) . The number of oxygen atoms in the sample. 2) . The element bromine can form oxides having several different formulae.
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Unformatted text preview: If 1.250 g of bromine is reacted with ozone to yield 1.876 g of an oxide Br x O y , what is the molecular formula of the oxide? 3) . An unknown organic compound contains only carbon, hydrogen, and oxygen. Combustion of 19.81 mg of this material produces 41.98 mg CO 2 and 6.45 mg H 2 O. The molar mass of the unknown compound is 166 g/mol. Determine the empirical formula and the molecular formula of this compound....
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