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Chapter2-3 - CHEMISTRY 1307 Chapter II Atoms Molecules and...

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8/31/2011 1 1 CHEMISTRY 1307 Chapter II Atoms, Molecules, and Ions 2 The Mole Chemistry is a quantitative science - we need a counting unit the: 1 mole is the amount of substance that contains as many particles (atoms, molecules) as there are in 12.0 g of 12 C. MOLE 518 g of Pb, 2.50 mol 3 Avogadro’s Number 6.0221415 10 23 Avogadro s Number Named for Amedeo Avogadro 1776-1856 There is Avogadro s number of particles in a mole of any substance.
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