Percentage_Composition_and_Empirical_Formula

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					          PERCENTAGE COMPOSITION AND EMPIRICAL FORMULA


1.   Find the percentage of oxygen in each of the following compounds:

     a) N2O                               ________



     b) C9H8O4 (aspirin)                  ________


2.   A 1.23 g sample of copper metal is reacted completely with chlorine gas to produce
     2.61 g of copper chloride. Determine the empirical formula of this chloride compound.


                                                                               __________

3.   Freons are gases used as refrigerants. Chemical analysis shows that a certain Freon is
     9.90% carbon, 58.70% chlorine and 31.40% fluorine by mass. Determine its empirical
     formula.


                                                                               _________

4.   Acetone is an important chemical solvent; a familiar home use is as nail polish remover.
     Chemical analysis shows that acetone is 62.0% carbon, 10.4% hydrogen and 27.5%
     oxygen by mass. Determine the empirical formula of acetone.


                                                                               _________

     The g-molecular weight of acetone is shown to be 58.1 g/mole. What is the molecular
     formula of acetone?

                                                                               ________

5.   A 2.885 g sample of metal is reacted with oxygen to yield 3.365 g of the oxide M2O3 .
     Compute the g-atomic weight of the element M.


                                                                               ________



6.   A 2.00 g sample of bromine was reacted completely with excess fluorine. The mass
     of the compound formed was 4.37 g. Determine its empirical formula.


                                                                             ________

7.   Determine the empirical formula of gold chloride if a 126 mg sample contains 81.8 mg
     of gold.


                                                                             ________


8.   A 0.709 g sample of iron reacts with HCl to give hydrogen gas and 1.610 g of a
     compound containing iron and chlorine. Identify the product and write the balanced
     equation for its formation.

				
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posted:8/16/2012
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