2. What is a Mole How many socks come in a pair? 2 How many eggs are in a dozen? 12 How many eggs come in a gross? 144 How many pencils come in a ream? 500

3. So how many things come in a mole?

4. Conversion Review Dimensional Analysis

5. Example Problems

7. Relative Mass

8. Molar Mass

9. Using molar mass

10. Converting between mass and atoms

12. Chemical Formulas and the Mole

13. Molar Mass of a Compound Determine the molar mass of each of the following compounds: NaOH CaCl 2 KC 2 H 3 O 2 C 2 H 5 OH HCN CCl 4 (NH 4 ) 3 PO 4

14. Converting moles to mass The characteristic odor of garlic is due to the compound (C 3 H 5 ) 2 S. What is the mass of 2.5 moles of (C 3 H 5 ) 2 S? What is the mass of 3.25 mol of H 2 SO 4 ?

15. Converting Mass to Moles Calculate the number of moles in 325 g of Calcium hydroxide Ca(OH) 2 ? Calculate the number of moles in 22.6 g of AgNO 3.

16. Mass to Number of Particles How many Aluminum Chloride molecules are present in 35.6 g of AlCl 3 How many Al atoms are there? How many Cl atoms are there?

17. Example Aluminum oxide (Al 2 O 3 ) when dissolved in water breaks apart into ions (Al 3+ and O 2- ) how many moles of Al 3+ will be produced when 1.5 moles of Al 2 O 3 are dissolved in water?

18. Examples 1. What is the molar mass of ethanol C 2 H 5 OH? How many ethanol molecules are present in 45.6 g? How many carbon atoms are there in 45.6 g of ethanol? How many hydrogen atoms are there in 45.6 g of ethanol? How many oxygen atoms are there in 45.6 g of ethanol? 2. A sample of sodium sulfite Na 2 SO 3 has a mass of 2.25 g How many molecules of sodium sulfite are there? How many atoms of sodium are there? How many atoms of Sulfur are there? How many atoms of oxygen are there?

20. Percent Composition The molar mass of NaOH is Na – 22.98 g/mol O – 16 g/mol H – 1 g/mol Total: 39.98 g/mol

21. Example NaHCO 3

22. Empirical Formula

23. Example Find the empirical formula for hydrogen peroxide which has a molar mass of 34 g/mol and is 5.9% Hydrogen and 94.1% Oxygen

24. Molecular Formula

25. Example

26. Find the empirical and molecular formula for a compound that is 26.5% K, 35.4% Cr, and 38.1% O and has a molar mass of 294.2 g/mol.

27. Example Find the empirical and molecular formula for a compound that is 26.7% carbon, 2.2% hydrogen, and 71.1% oxygen and has a molar mass of 90 g/mol.