Lecture_Notes_090909a

Lecture_Notes_090909a - Alternate Solution y A compound...

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Percent Composition in a Compound y The percent by mass of each element in the compound y CFC’s were used as refrigerants and industrial solvents and are blamed for the destruction of the ozone layer. CCl 2 F 2 is the general formula for chlorofluorocarbon, or CFC. Determine the mass percent of each element in CFC
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Empirical vs Molecular Formula
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Determining Empirical Formula y Ibuprofen, an aspirin substitute, has the following mass percent composition: C 75.69%, H 8.80% and O 15.51%. What is the empirical formula of ibuprofen?
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The empirical formula for a particular compound was found to be C 2 H 2 NO. If the molar mass of the compound is 280.25 g/mol what is the molecular formula? C2H2NO C4H4N 2 O2 C1 0 H1 N 5 O Ca n no t b e d ter m i 6% 3% 66% 26% 1. C 2 H 2 NO 2. C 4 H 4 N 2 O 2 3. C 10 H 10 N 5 O 5 4. Cannot be determined
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Determining Molecular Formula y A compound with the percent composition shown below has a molar mass of 60.10 g/mol. Find its molecular formula with a percent composition C 39.97%, H 13.41% and the rest N.
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Unformatted text preview: Alternate Solution y A compound with the percent composition shown below has a molar mass of 60.10 g/mol. Find its molecular formula with a percent composition C 39.97%, H 13.41% and the rest N. Combustion Reactions Determining Molecular Formula from Combustion y The foul odor of rancid butter is due largely to butyric acid, a compound containing carbon, hydrogen, and oxygen. Combustion analysis of a 4.30 g sample of butyric acid produced 8.59 g CO 2 and 3.52 g H 2 O. The molecular mass of butyric acid is 88.11 g/mol, determine the molecular formula of butyric acid. Summary of Process for Determining Molecular Formulas y Find the mass of each element present y Change mass to moles y Find the mole ratio y Change to a whole number ratio for the empirical formula y Use the molar mass and the empirical formula mass to determine the number of empirical formula units in the molecule...
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Lecture_Notes_090909a - Alternate Solution y A compound...

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