Ch3(8-10)Sep12Fa08a

Ch3(8-10)Sep12Fa08a - CHEM 109 General Chemistry University...

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Unformatted text preview: CHEM 109 General Chemistry University of Nebraska FALL 2008 Friday 12 September 2008 ANNOUNCEMENTS: SuperJam: Monday: 6:00 7:15 Henz 124 Dr. Kautz Tuesday: Hamilton Rm. 110 Dr. Hartung 6-7:15 & Dr. Powers 7:30-8:45 Percent Composition is the percentage by mass contributed by each element in the substance . Mass Percent Composition No matter what its source, a particular chemical compound is composed of the same elements in the same parts (fractions) by mass. 8.0 g of Ca 2.4 g of C 9.6 g of O Mass Percent Composition part whole Percent = 100 In this case we know the masses of each component Mass Percent Composition Calculate the percentage of platinum in the compound PtCl 2 (NH 3 ) 2. In this case we dont know any masses. So, first determine the Molar Mass of the compound Atomic weight Pt 195.09 amu Atomic weight of Cl 35.453 amu Atomic weight of N 14.0067 amu Atomic weight of H 1.0079 amu Total weight of Pt 1 x 195.09 = 195.09 amu Total weight of Cl 2 35.453 = 70.906 amu Total weight of N 2 14.0067 = 28.0134 amu Total weight of H 6 1.0079 = 6.0474 amu...
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Ch3(8-10)Sep12Fa08a - CHEM 109 General Chemistry University...

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