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9-30-10 - Lecture 3 - Chapter3

9-30-10 - Lecture 3 - Chapter3 - Counting Atoms Chemistry...

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Unformatted text preview: Counting Atoms Chemistry is a quantitative science—we need a “counting unit.” MOLE 1 mole is the amount of substance that contains as many particles (atoms, molecules) as there are 12 in 12.0 g of 12C. in Particles in a Mole Avogadro’s Number Amadeo Avogadro 1776-1856 NA = 6.0221 x 1023/mol 6.0221 *There is Avogadro’s number of particles in a mole of any substance. Weighing Moles 1 mole of Iron vs. 1 mole of Sulfur Figure 3.5 Combustion apparatus for determining formulas of organic compounds. m m CnHm + (n + 2 ) O2 = n CO2(g) + H O(g) 22 ...
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