Ch. 3_Notes 15 Sep

# Ch. 3_Notes 15 Sep - 15Sep09 Ch.3 (6.0222x10_23)ofthe...

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15 Sep 09 Ch. 3 The Molar Mass of a substance  is the mass in grams of one mole (6.0222 x 10_23) of the  compound. Comparison:   Thousand Grain Weight (TGW) Example:  The molar mass of Methane (CH4) Mass of 1 mol C: 12.01g   Mass of 4 mol H: +    4.032g ___(4 x 1.008g) Mass of 1 mol CH4: 16.0 42       ___     16.04g Sample Exercise 3.6: Calculating Molar Mass 1 (p. 86) Juglone, a dye known for centures, is produced from the husks of  black walnuts.  It is also a  natural herbicide that kills off competititve plants around the black walnut tree but does not  affect grass and other noncompetitive plans. The formula for juglone is  C 10 H 6 O 3 A sample of 1.56 x 10 -2 - 1.56 x 10^-2 g juglone / (174.1 g/mol) = 8.96 x 10^ -5 3.5: Percent Composition of Compounds Mass %: (# of atoms of the element) x (atomic mass of the element )  x 100% molar mass of the compound

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## This note was uploaded on 08/29/2011 for the course CHEM 101 taught by Professor Luikang during the Fall '10 term at SPSU.

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Ch. 3_Notes 15 Sep - 15Sep09 Ch.3 (6.0222x10_23)ofthe...

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