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The Mole

A Chemist’s “Dozen”. The Mole. http://www.ccs.k12.in.us/chsteachers/VKundrat/MOLE_DAY_EXPLOD%5B1%5D.gif. The Mole. The particles that make up matter (ions, atoms, and molecules) are extremely small

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The Mole

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  1. A Chemist’s “Dozen” The Mole http://www.ccs.k12.in.us/chsteachers/VKundrat/MOLE_DAY_EXPLOD%5B1%5D.gif

  2. The Mole • The particles that make up matter (ions, atoms, and molecules) are extremely small • Only large amounts of these particles can be weighed. In order to simplify these large numbers we use the mole • 1Mole = 6.022 x 1023 particles • Particles can be atoms, molecules, ion, bananas, lollipops, etc.

  3. The Mole • 1Mole = 6.022 x 1023 particles • Particles can be atoms, molecules, ion, bananas • 6.022 x 1023 is known as Avogadro’s Number AmedeoAvagadro 1776-1856

  4. The Mole • How does the mole get this specific value? • The value of the mole is equal to the number of atoms in exactly 12 grams of pure carbon-12. • 12g C = 1 mole C atoms = 6.022 x 1023 C atoms • This definition gives a relationship between mass (grams) and the number of atoms (Avagadro’s number)

  5. The Mole • A Road Map Grams Atoms Mole Gram formula mass Molar Mass 6.022 x 1023 Avagadro’s Number Remember: The Molar Mass is the sum of the weights of each element in the compound. NH3 would be 1(14)+3(1)= 17 g/mol

  6. The Mole • E.g. How many atoms are in one mole of pennies? 1 mole pennies 6.022 x 1023 pennies = 6.022 x 1023 pennies 1 mole pennies Avagadro’s Number http://www.vectorjunky.com/gallery/m/Mole-with-Shovel.jpg

  7. The Mole • E.g. How many grams are in 1 mole of sodium? 1 mol Na 23 g Na = 23 grams sodium 1 mol Na This is the Gram Formula Mass (gfm) ratio

  8. The Mole • E.g. How many molecules are in 13 grams of H2SO4? • Solve in two steps. 13 g H2SO4 1 mol H2SO4 6.022 x 1023 molecules H2SO4 = 98 g H2SO4 1 mol H2SO4 = 7.988 x 1022 molecules H2SO4 Avagadro’s Number Gfm

  9. The Mole • E.g. How many moles are in 31 atoms of copper? 31 atoms 1 mol = 5.148 x 10-23 moles copper 6.022 x 1023 Avagadro’s Number http://farm5.static.flickr.com/4007/4212783868_9ba7287e6e.jpg

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