1. Factor Label Practice http://www.guinnessworldrecords.com/

2. The Mol… Just another unit of measurement In one mole of atoms or molecules, there are 6.022 x 10 23 atoms or molecules (HCl or S) Just like in one dozen eggs, there are 12 eggs. Atoms and molecules are EXTREMELY small, that is why the mol is such a BIG number The mol makes it easier to represent such a large number You wouldn’t express the distance to California in centimeters, you would express it in kilometers

3. Let’s practice How many H atoms are in 1 mole?

4. How many molecules of CO are in 1 mol of CO?

5. How many moles of sodium are in 2.9 x 10 22 atoms of sodium?

6. Using your calculator Use the EE button! –EE means ‘times 10 to the ___ power” –1.0 EE 9 = 1.0 x 10 9

7. More practice How many sodium atoms are in 2.5 moles of sodium? How many molecules of carbon dioxide are in 0.5 moles of carbon dioxide? How many atoms is this?

8. How many moles are in 1 billion atoms of lithium?

9. More practice How many atoms are in 3.0 moles of osmium? How many molecules of sulfur monoxide are in.75 moles? How many moles are in 2.3 x 10 24 atoms of Cu?

10. Molecules and atoms How many oxygen atoms are in 1 molecule of O 2 ? How many hydrogen atoms are in 1 molecule of C 3 H 8 ? How many carbon atoms are present? To go from molecules to atoms→ count how many of each atom are in the molecule

11. Practice How many hydrogen atoms are in 1 methane molecule? How many nitrogen atoms are in 1 lead II nitrate molecule?

12. Molar Mass This is also known as gram atomic mass (for an atom), gram formula mass (for an ionic compound) and gram molecular mass The mass of 1 mole of an atom or a molecule

13. Gram atomic mass The mass (g) of 1 mole of an atom → Use the periodic table GAM of –carbon is 12.0 g –oxygen is 16.0 g –Go to the 10ths

14. What is the GAM of –Iodine –Calcium?

15. Gram Molecular Mass What is formula for: –sulfur dioxide? –Diphosphorous pentoxide? GMM = add up atomic masses

16. Gram Formula (ionic) Mass What is the GFM of KCl? Cu(NO 3 ) 2 ?

17. QUIZ: Please do on a half a sheet of paper 1.How many grams of water are in 2.0 mols of water? 2.How many moles of Mg is 1.25 x 10 23 atoms of Mg? How many grams is this? 3.How many atoms are in 2.8 x 10 24 molecules of SiO 2 ? How many grams is this? 4.How many liters does 8.5 grams of oxygen gas occupy? (Assume STP)

18. Hint for homework Representative particle = atoms or molecules.

19. Mole / Volume Relationship 1 mol of gas at STP = 22.4 Liters STP = Standard Temperature and Pressure Standard Temp = 0 o C Standard Pressure = 101.3 kPa (kiloPascals) or 1.0 atm (atmospheres)

20. 1. How many liters of space does 1.73 mol of NH 3 gas take up at STP? 1.73 mol NH 3 1 mol NH 3 22.4 L NH 3 = 38.7 L NH 3 2. How many moles of O 2 are equal to 9.6 liters? 9.6 L O 2 22.4 L O 2 1 mol O 2 = 0.43 mol O 2

21. Practice for test Collect 2.0 moles of water. How many mL is this? Collect 0.75 moles of potassium sulfate. Collect 8.0 x 10 24 molecules of barium chloride. Collect 3.0 x 10 23 atoms of aluminum. Collect 2.0 grams of sodium chloride. How many moles is this? How many molecules?

22. Homework Monday’s homework in Unit Calendar Page 186 #24-27; Page 198 #55 a-c, 57, 59 Worksheet 7.1