1. Molar Conversions

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

3. Dozen = 12 of anything

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

5. Moles = 6.022 x 10 23 of anything

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

7. Converting to Moles

8. From Mass Use atomic masses from the periodic table NaCl = 58.5 g/mole * 6.022 x 10 23 amu = 1 g

9. From Gas Volume At STP multiply volume by (1 mole/22.4 L) At non-STP use PV = nRT

10. Particles to Moles Multiply # particles by this conversion factor: 1 mole atoms OR molecules 6.02 x 10 23 atoms OR molecules * pay attention to the question!

11. From Sol’n Volume Multiply molarity (M) by volume (in L) n = M x V * M = moles/L

12. Convert 7.0 g of silicon to moles of Si

13. 7.0 g Si 1 mole Si = 2.5 x 10 -1 mol Si 28.0855 g Si

14. Convert 250 g of CaCO 3 to: moles of CaCO 3 how many moles of O?

15. 250 g CaCO 3 1 mol CaCO 3 = 2.5 mol CaCO 3 250 g CaCO 3 1 mol CaCO3 3 mol O = 7.5 mol O 100.0872 g CaCO 3 1 mol CaCO 3

16. Convert 3.0 moles of helium to grams of He

17. 3.0 mol He 4.0026 g He = 12 g He 1 mol He

18. Convert 5.6 L of oxygen gas at STP to moles Oxygen atoms

19. 5.6 L O 2 1 mole O 2 2 mol O = 0.50 mol O 22.4 L1 mol O 2

20. Convert 0.500 moles of helium to volume at STP

21. 0.500 mol He 22.4 L He = 11.2 L He 1 mol He

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

23. 2.0 x 10 24 atoms He 1 mol He = 3.3 mol He 6.02 x 10 23 atoms He

24. Convert 3.0 moles of glucose to molecules

25. 3.0 mol C 6 H 12 O 6 6.022 x 1023 molecules C 6 H 12 O 6 = 1.8 x 10 24 molecules C 6 H 12 O 6 1 mol C 6 H 12 O 6

26. Convert 250 mL of 0.10 M HCl to moles

27. 0.10 M HCL = 0.10 mol HCL 250 mL 1 L 0.10 mol HCL = 2.5 x 10 -2 mol HCL 10 3 mL 1 L H 2 O 1 L

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

29. 60 g NaOH 1 mol NaOH = 1.500 mol NaOH 1.500 mol NaOH = 0.75 M NaOH X = 2 L H 2 O 39.9971 g NaOH X L H 2 O

30. Convert 6.8 g NH 3 to volume at STP

31. 6.8 g NH 3 1 mole NH 3 22.4 L NH 3 = 8.9 L NH 3 17.031 g NH 3 1 mole NH 3

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

33. 3.0 x 10 25 molecules CO 2 1 mol CO 2 44.095 g CO 2 1kg = 2.2 kg 6.022 x 10 23 molecules CO 2 1 mole CO 2 10 3 g

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

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

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