Mole conversions

Chemistry Notes on Mole Conversions between Moles, Grams, and Particles.

1. MOLE CONVERSIONS Unit 7: The Mole

2. WHY DO WE NEED TO CONVERT MOLES? Moles can be converted to find the number of grams or the number of particles in a sample. If you have moles, grams, or particles you can convert it to another unit. Particles can be atoms (single element), molecules (covalent compound), or formula units (ionic compound)

3. WHAT ARE THE CONVERSIONS? Mass  Moles divide by molar mass Particles  Moles multiply by A vogadro’s number Particles  Mass divide by Avogadro’s number; multiply by molar mass

4. WHAT IS DIMENSIONAL ANALYSIS? Dimensional analysis is a way of organizing calculations to keep track of units. You must show your work this way – if you get used to it now, stoichiometry (next unit) will be easier!

5. PRACTICE How many moles are in 45.98 g of Na?

6. PRACTICE How many particles are in 2 moles of NaCl ?

7. PRACTICE How many grams are in 6.02x10 23 molecules of water?

8. PRACTICE How many moles are in 8.91x10 24 atoms of magnesium?