1. 1. Determine the Gram Formula Mass of a compound 2. Convert between Grams and Moles 3. Convert between Moles and Grams

2. Every element has a different atomic mass

3. 12.011g = 1 mole 12.011g/mole

4. Molar Mass = 207.2 g/mol 1 mole of Lead = 207.2 g

5. Atomic Mass has a unit of grams/mole Mass of Magnesium = 24.305 g/mol 1 mole of Magnesium is 24.305 grams

7. Mass of Mg 24.305 g/mol Solve the following problem: How many moles are present in 55 g of Magnesium?

8. Convert 55g of Mg to Moles 55 g Mg 24.305 g Mg 1 mol Mg = 2.26 moles Mg If 1 mole is 24 g, I predict 55 g is more than 1 mole

10. 1. Cu(NO 3 ) 2 #1 How many of each atom are present #2 What are the masses of each atom? #3 Multiply the # of atoms by the mass #4 Add up the amounts and this is the Gram Formula Mass Cu = 1 N = 2 O = 6 63.546 g/mol 14.007 g/mol 15.999 g/mol X X X + 187.554 g/mol 1 mole of Cu(NO 3 ) 2 is 187.554 g

13. 2. KMnO 4 #1 How many of each atom are present K = 1 Mn = 1 O = 4 #2 What are the masses of each atom? 39.098 g/mol 54.938 g/mol 15.999 g/mol #3 Multiply the # of atoms by the mass X X X #4 Add up the amounts and this is the Gram Formula Mass + 158.032 g/mol 1 mole of KMnO 4 is 158.032 g

14. Do the rest as Homework! Now, take out “Moles and Mass”

16. Convert 25g of NaCl to Moles #1 Name the Compound 1. NaCl = Sodium Chloride #2 Find the GFM Na = 1 x 22.990 g/mol Cl = 1 x 35.453 g/mol + 58.443 g/mol #3 Convert grams to moles (Use dimensional analysis) 25 g NaCl 58.443 g NaCl 1 mol NaCl Conversion Factor! = 0.43 moles NaCl If 1 mole is 58 g, I predict 25 g is less than 1 mole

18. Convert 405 g of Ag 2 SO 4 to Moles #1 Name the Compound 2.Ag 2 SO 4 = Silver (I) Sulfate #2 Find the GFM Ag = 2 x 107.87 g/mol S = 1 x 32.06 g/mol O = 4 x 15.999 g/mol + 311.796 g/mol #3 Convert grams to moles (Use dimensional analysis) 405 g Ag 2 SO 4 311.796 g Ag 2 SO 4 1 mol Ag 2 SO 4 Conversion Factor! = 1.30 moles Ag 2 SO 4 If 1 mole is 311 g, I predict 405g is more than 1 mole

19. Do Not Forget Units Predictions Help

21. Section 2 (on back): Converting from Moles to Grams Simply flip the conversion factor around!

23. Convert 0.250 moles of NaCl to grams #1 Name the Compound 1. NaCl = Sodium Chloride #2 Find the GFM Na = 1 x 22.990 g/mol Cl = 1 x 35.453 g/mol + 58.443 g/mol #3 Convert moles to grams(Use dimensional analysis) 0.250 mol NaCl58.443 g NaCl 1 mol NaCl Conversion Factor! = 14.6 grams NaCl If 1 mole is 58 g, and I have 0.250 moles, the answer should be less than 58 g of NaCl Notice moles on bottom!

25. Convert 1.70 moles of SiO 2 to grams #1 Name the Compound 2. SiO 2 = Silicon Dioxide #2 Find the GFM Si = 1 x 28.086 g/mol O = 2 x 15.999 g/mol + 60.084 g/mol #3 Convert moles to grams(Use dimensional analysis) 1.70 mol SiO 2 60.084 g SiO 2 1 mol SiO 2 Conversion Factor! = 102.1428 g SiO 2 If 1 mole is 60 g, and I have 1.70 moles, the answer should be more than60 g of SiO 2 Notice moles on bottom!

26. 1. Determine the GFM of a compound 2. Convert between Grams and Moles Try the rest as Homework 3. Convert between Moles and Grams

27. Gram Formula Mass # 3,4,5,6,7

28. 3. Fe 2 SO 4 #1 How many of each atom are present Fe = 2 S = 1 O = 4 #2 What are the masses of each atom? 55.847 g/mol 32.066 g/mol 15.999 g/mol #3 Multiply the # of atoms by the mass X X X #4 Add up the amounts and this is the Gram Formula Mass + 207.7576 g/mol 1 mole of Fe 2 SO 4 is 207.7576 g

29. C 6 H 12 O 6 C = 6 x 12.011g/mol H = 12 x 1.0079g/mol O = 6 x 15.999g/mol + 180.1548 g/mol This bag is 1 mole or 6.02 x 10 23 molecules of Sucrose

30. Mass to Moles Side #1 = 3,4,5

31. Convert 105.5 g of P 2 O 5 to Moles #1 Name the Compound 3. P 2 O 5 = Phosphorus Pentoxide #2 Find the GFM P= 2 x 30.974 g/mol O = 5 x 15.999 g/mol + 141.945g/mol #3 Convert grams to moles (Use dimensional analysis) 100.5 g P 2 O 5 141.945 g P 2 O 5 1 mol P 2 O 5 Conversion Factor! =.70 moles P 2 O 5 If 1 mole is 142 g, I predict 100.5g is less than 1 mole

32. Convert 538.2 g of (NH 4 ) 2 CrO 4 to Moles #1 Name the Compound 4. ( NH 4 ) 2 CrO 4 = Ammonium Chromate #2 Find the GFM N = 2 x 14.0067 g/mol H = 8 x 1.0079 g/mol S = 1 x 32.066 g/mol O = 4 x 15.999 g/mol + 132.14 g/mol #3 Convert grams to moles (Use dimensional analysis) 538.2 g (NH 4 ) 2 CrO 4 132.14 g (NH 4 ) 2 CrO 4 1 mol (NH 4 ) 2 CrO 4 Conversion Factor! = 4.07 moles (NH 4 ) 2 CrO 4 If 1 mole is 132 g, I predict 538.2g is more than 1 mole

33. Convert 75 g of TiO 4 to Moles #1 Name the Compound 5. TiPO 4 = Titanium Phosphate #2 Find the GFM Ti= 1 x 47.88 g/mol O = 4 x 15.999 g/mol + 111.878 g/mol #3 Convert grams to moles (Use dimensional analysis) 75 g TiO 4 111.878 g TiO 4 1 mol TiO 4 Conversion Factor! =.67 moles TiO 4 If 1 mole is 112 g, I predict 75g is less than 1 mole

34. Moles to Grams Side #2 = 3,4,5

35. Convert.0078 moles of CrPO 4 to grams #1 Name the Compound 3. CrPO 4 = Chromium Phosphate #2 Find the GFM Cr = 1 x 51.9961 g/mol P = 1 x 30.9738 g/mol O = 4 x 15.999 g/mol + 146.968g/mol #3 Convert moles to grams(Use dimensional analysis).0078 mol CrPO 4 146.968 g CrPO 4 1 mol CrPO 4 Conversion Factor! = 102.1428 g SiO 2 If 1 mole is 145 g, and I have.0078 moles, the answer should be less than 145 g of CrPO 4 Notice moles on bottom!

36. Convert.31 moles of N 2 O to grams #1 Name the Compound 4. N 2 O = Dinitrogen Monoxide #2 Find the GFM N = 2 x 14.00674g/mol O = 1 x 15.999 g/mol + 44.0129 g/mol #3 Convert moles to grams(Use dimensional analysis).31 mol N 2 O44.0129g N 2 O 1 mol SiO 2 Conversion Factor! = 102.1428 g SiO 2 If 1 mole is 44 g, and I have.31 moles, the answer should be less than 44 g of N 2 O Notice moles on bottom!

37. Convert 83.1 moles of I 2 to grams #1 Name the Compound 5. I 2 = Iodine Gas #2 Find the GFM I = 2 x 126.904 + 253.808 g/mol #3 Convert moles to grams(Use dimensional analysis) 83.1 mol I 2 253.808 g I 2 1 mol I 2 Conversion Factor! = 102.1428 g SiO 2 If 1 mole is 254 g, and I have 83.1 moles, the answer should be more than 254 g of I 2 Notice moles on bottom!