Warm-up Write names for the following compounds/molecules:

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Presentation transcript:

Warm-up Write names for the following compounds/molecules: C2F6 Pb2O3 Write formulas for the following compounds/molecules: Dinitrogen pentafluoride Zinc Bromide

Unit Five, Day Three Chemistry: Moles!

Moles A mole is simply a unit of measurement 1 mole = 6.02 x 1023 particles 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

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

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

Try these CaCl2 Mg(OH)2 NaCl H2S PbCl2

The “Mole Hill”

Mole Conversions Just use the mole hill!! Start with the given Figure out where you need to go. Solve Ex. How many moles of water are there in 25.0 grams? 14.2 moles of H2O = ? Molecules

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.

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

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?