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The Mole

The Mole. What is a mole?. Mole in Chemistry. It’s a quantity. Like 1 dozen = 12 items Like 1 gross = 144 things Like 1 ream = 500 of something So, how many things are in a mole?. 1 mole = 6.022 x 10 23 particles of some element or compound. How much?!!.

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The Mole

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  1. The Mole

  2. What is a mole?

  3. Mole in Chemistry • It’s a quantity. • Like 1 dozen = 12 items • Like 1 gross = 144 things • Like 1 ream = 500 of something • So, how many things are in a mole? 1 mole = 6.022 x 1023 particles of some element or compound

  4. How much?!! 602,200,000,000,000,000,000,000 atoms. This number is also known as “Avogadro’s Number” Named after Amedeo Avogadro (1776-1856)

  5. A Mole of….. • 1 mole of water = 6.022 x 1023 molecules of H2O • 1 mole of oxygen = 6.022 x 1023 atoms of oxygen • 1 mole of gold = 6.022 x 1023 atoms of gold • 1 mole of CO2 = 6.022 x 1023 molecules of CO2 • 1 mole of carbon = 6.022 x 1023 atoms of C

  6. How do you know when you have a mole? • To get a dozen of cupcakes, you count out 12 cupcakes. • Are we really going to count out 6.022 x 1023 atoms? • Of course not! • So how do you now when you have a mole? • We use mass.

  7. What? You use mass to count? • Yes. • Because we can’t actually count out 1 mole of atoms, we use atomic mass. • 1 mole = 6.022 x 1023 atoms = atomic mass in grams. • Thus, 1 mole hydrogen = 6.022 x 1023 atoms = 1.00 g

  8. Moles = Grams • 1 mole of C = 6.022 x 1023 atoms of C = 12.0107 g • 1 mole of O = 6.022 x 1023 atoms of O = 15.9994 g • 1 mole of Au = 6.022 x 1023 atoms of Au = 196.966 g

  9. What happens if you don’t have an element but a compound? • Add up the masses of the elements in the compound. • 1 mole of CO2 = 6.022 x 1023 molecules of CO2 = 44.00 g carbon = 12.0107 g oxygen = 15.999 x 2 = 31.998 g total = 44.0087 g

  10. How about another example? • 1 mole of water = 6.022 x 1023 molecules of H2O = 18 g Hydrogen = 1.00 g x 2 = 2.00g Oxygen = 15.999 g total = 17.999 g

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