1. Drill: Calculate the % composition of each element in Fe 2 (SO 4 ) 3

2. Molar Conversions

3. Moles The standard unit of measure for the amount of a substance in numbers

4. Dozen = 12 of anything

5. Moles = the amount of a substance that would = its mass in g from the PT

6. Moles = 6.022 x 10 23 of anything

7. Molar Conversions Mass to moles Volume of a gas to moles Particles to moles Volume of a solution to moles

8. Moles First

9. Mass to Moles Use atomic masses from the periodic table NaCl = 58.5 g/mole

10. Gas Volume to Moles At STP: 22.4 L/mole Non-STP: PV = nRT PV RT n =

11. Particles to Moles Use Avogadro’s Number 6.02 x 10 23 atoms, molecules, etc/mole

12. Soln Volume to Moles Multiply molarity times volume n = M x V

13. Solution Measures Molarity (M) = the number of moles of solute per liter of solution Others later

14. Calculate the atomic mass of the element made up of the following isotopes: 99.50 % H-1 0.30 % H-2 0.20 % H-3

15. Calculate the atomic mass of the element made up of the following isotopes: 5.0 % Pu-242, 5.0 % Pu-243 80.0 % Pu-244, & 10.0 % Pu-245

16. Convert 7.0 g of silicon to moles

17. Convert 250 g of CaCO 3 to moles

18. Convert 3.0 moles of helium to grams

19. Convert 5.6 L of oxygen gas at STP to moles

20. Convert 0.50 moles of helium to volume at STP

21. Convert: 2.0 x 10 24 atoms He to moles

22. Convert 3.0 moles of glucose to molecules

23. Convert 250 mL of 0.10 M HCl to moles

24. Determine the volume required to make 60.0 g NaOH into a 0.75 M solution

25. Convert 6.8 g NH 3 to volume at STP

26. Convert 3.0 x 10 25 molecules of CO 2 to mass in kg

27. Calculate the number of oxygen atoms in 32  g of Fe 2 O 3

28. Calculate the number of atoms in 16 ng of Fe 2 (SO 4 ) 3

29. Calculate the mass of solute required to make 40.0 mL of 0.25 M Pb(NO 3 ) 2

30. Chapter 3 General Define all the Key Terms on page 74

31. Atomic Mass Work problems: 1 - 9 on page 75

32. Avogadro’s Num. Work problems: 11 - 18 on page 75

33. Molar Conversions Work problems: 18 - 26 on page 75 & 76

34. % Composition Work problems: 27 - 34 on page 76

35. Empirical Formula Work problems: 35 - 46 on page 76 & 77

36. Balancing Rxns Work problems: 49 & 54 on page 77

37. Stoichiometry Work problems: 55 & 64 on page 77 & 78

38. Limiting Reactant Work problems: 65 & 74 on page 78 & 79