Chapters1-2-review

Chapters1-2-review - quired to know in Chapter 1 ltons...

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Required to know in Chapter 1 Know the concepts and ideas behind the  theories and laws. Historical details are not necessary.                   How does the atomic theory apply to                                                 modern chemistry? Structure of the atom (nucleus, electrons, protons, etc.) Chemical formulae, molecules Isotopes  Moles, molar masses Empirical vs. molecular formula Know how to calculate % composition from a  chemical formula and the reverse.  Be able to do  “combustion analysis problems ”.
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Percent composition from chemical formula Problem: The molecular formula of Tylenol is C 8 H 9 NO 2 . Determine mass percent of H, C, N, O Mass C 8 mol x 12.011 g/mol=96.088g H 9 mol x 1.0079 g/mol =9.0711g N 1 mol x 14.007 g/mol=14.007 g O 2 mol x 15.999 g/mol=31.998 g Molar mass of Tylenol=151.16 g Mass percent (96.088/151.16)x100% (9.0711/151.16)x100% (14.007/151.16)x100% (31.998/151.16)x100% 64%C , 6%H, 9%N , 21%O
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Chemical formula from percent composition Problem: A binary compound of silver and chlorine is 75.26% silver by mass. What is the empirical formula of the compound?? Mass percent of silver =
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This note was uploaded on 03/30/2010 for the course CHEM 116 taught by Professor Prolavarapu during the Spring '06 term at Vanderbilt.

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Chapters1-2-review - quired to know in Chapter 1 ltons...

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