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Warm-up

Warm-up. Hope everyone had a great weekend!!! Write names for the following compounds/molecules: C 2 F 6 PbO 2 Write formulas for the following compounds/molecules: Dinitrogen pentafluoride Zinc (II) Bromide. Unit Five, Day Three Kimrey 15 October 2012. Chemistry: Moles!. Moles.

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Warm-up

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  1. Warm-up • Hope everyone had a great weekend!!! • Write names for the following compounds/molecules: • C2F6 • PbO2 • Write formulas for the following compounds/molecules: • Dinitrogenpentafluoride • Zinc (II) Bromide

  2. Unit Five, Day Three Kimrey 15 October 2012 Chemistry:Moles!

  3. Moles • A mole is simply a unit of measurement • 1 mole = 6.02 x 1023particles • Particles can be expressed as molecules, ions, or atoms • 1 mole = the formula mass (in grams) • The number of particles in a mole is referred to as Avogadro's number

  4. 1 mole = the formula mass • Sum of all the atomic masses in a compound • add up the average atomic mass for each atom in the compound • Units are grams per mole • Also called the molar mass

  5. Example • Calculate the molar mass: • H2O • 1.008 + 1.008 + 16 = 18.016g • So, 1 mole of H2O has a mass of 18.016 grams

  6. Try these • CaCl2 • Mg(OH)2 • NaCl • H2S • PbCl2

  7. The “Mole Hill”

  8. Mole Conversions • Remember the conversions we’ve done!!!! • Start with the given • Write what you want over what you have. • Solve • Ex. How many moles of water are there in 25.0 grams? • 14.2 moles of H2O = ? Molecules

  9. 2 Step Conversions. • Notice on the mole hill there is no way to get to grams from particles directly. • You must go through moles! • Step 1 convert what you have to moles • Step 2 convert moles to what you want.

  10. Example • 5o grams of H2O = ? Molecules • 1.6 x 1040 molecules of MgCl2 = ? Grams

  11. Practice • How many grams of NaCl are in 45.3 moles? • How many atoms of Mg in 35.2 grams? • How many moles are in 50.0 grams of oxygen?

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