1. Mole Gangnam Style https://www.youtube.com/watch?v=HnRHBw-xjVo

3. Mole Map Grams mole molecules atoms Atoms (element) 6.02 x 10 23 # atoms per molecule 6.02 x 10 23 formula unit # ions per formula unit MrMr

4. Dimensional Analysis How many moles are in 45.7 g of NO 2 ? Molar mass NO 2 = 14.007 g + 2(15.999 g) = 46.005 g/mol 1.Ask yourself the question – Can I convert directly from grams to moles? YES – molar mass has units of grams/mole 2. Start with your “given” from the original problem. 3. Use conversion factor that will allow you to “cancel” out grams and give you moles. 45.7 g of NO 2 46.005 g 1 mol = 0.993 mol 4. Calculate & express answer with correct sig. figs. and units!

5. Dimensional Analysis 1.Ask yourself the question – Can I convert directly from moles to atoms of an element? YES – there are 6.02 x 10 23 atoms per mole 2. Start with your “given” from the original problem. 3. Use conversion factor that will allow you to “cancel” out grams and give you moles. 10.0 mol Fe 1 mol Fe 6.02 x 10 23 atoms Fe = 6.02 x 10 24 Fe atoms 4. Calculate & express answer with correct sig. figs. and units! How many atoms are in 10.0 moles of Iron (Fe)?

6. Dimensional Analysis 1.Ask yourself the question – Can I convert directly from grams to molecules? NO– I have to go through moles 2. Start with your “given” from the original problem. 3. Use conversion factor that will allow you to “cancel” out grams and give you moles. 12.1 g H 2 SO 4 98.078 g 1 mol = 7.37 x 10 22 molecules 4. Calculate & express answer with correct sig. figs. and units! How many molecules are in 12.1 g of H 2 SO 4 ? 6.02 x 10 23 molecules 1 mol

7. Dimensional Analysis NOTE: How many atoms are in 1 molecule of H 2 SO 4 ? 210.0 g H 2 SO 4 98.078 g 1 mol = 9.023 x 10 24 atoms How many atoms are in 210.0 g of H 2 SO 4 ? 6.02 x 10 23 molecules 1 mol 2H + 1S + 4O = 7 total atoms per molecule 1 molecule H 2 SO 4 7 atoms

8. Dimensional Analysis What is the formula for potassium oxide? 32.6 g K 2 O 94.195 g 1 mol = 2.08 x 10 23 formula units How many formula units are in 32.6 grams of potassium oxide? 6.02 x 10 23 f. units 1 mol K2OK2O

9. Dimensional Analysis What is the formula for lithium sulfate? 125 g Li 2 SO 4 109.944 g 1 mol = 1.37 x 10 24 Li ions How many lithium ions are in 125g of lithium sulfate? 6.02 x 10 23 f. units 1 mol Li 2 SO 4 1 f. unit Li 2 SO 4 2 Li ions How many lithium ions are in one formula unit? 2