1. 1 Chapter 6 Chemical Quantities 6.3 Molar Mass Copyright © 2008 by Pearson Education, Inc. Publishing as Benjamin Cummings

2. 2 Molar Mass The molar mass Is the mass of one mol of an element or compound. Is the atomic mass expressed in grams. Copyright © 2008 by Pearson Education, Inc. Publishing as Benjamin Cummings

3. 3 Molar Mass from the Periodic Table Molar mass Is the atomic mass expressed in grams. Copyright © 2008 by Pearson Education, Inc. Publishing as Benjamin Cummings

4. 4 Give the molar mass for: A. 1 mol K atoms =________ B. 1 mol Sn atoms =________ Learning Check

5. 5 Give the molar mass for: A. 1 mol K atoms =39.10 g B.1 mol Sn atoms =118.7 g Solution

6. 6 Molar Mass of a Compound The molar mass of a compound is the sum of the molar masses of the elements in the formula. Example: Calculate the molar mass of CaCl 2. ElementNumber of Moles Atomic MassTotal Mass Ca140.08 g/mol 40.08 g Cl235.45 g/mol 70.90 g CaCl 2 110.98 g

7. 7 Molar Mass of K 3 PO 4 Calculate the molar mass of K 3 PO 4. ElementNumber of Moles Atomic MassTotal Mass in K 3 PO 4 K339.10 g/mol 117.3 g P130.97 g/mol 30.97 g O416.00 g/mol 64.00 g K 3 PO 4 212.3 g

8. 8 Some One-Mol Quantities 32.07 g 55.85 g 58.44 g 294.20 g 342.30 g Copyright © 2008 by Pearson Education, Inc. Publishing as Benjamin Cummings

9. 9 What is the molar mass of each of the following? A. K 2 O B. Al(OH) 3 Learning Check

10. 10 A. K 2 O 94.20 g/mol 2 mol K (39.10 g/mol) + 1 mol O (16.00 g/mol) 78.20 g + 16.00 g = 94.20 g B. Al(OH) 3 78.00 g/mol 1 mol Al (26.98 g/mol) + 3 mol O (16.00 g/mol) + 3 mol H (1.008 g/mol) 26.98 g + 48.00 g + 3.024 g = 78.00 g Solution

11. 11 Prozac, C 17 H 18 F 3 NO, is an antidepressant that inhibits the uptake of serotonin by the brain. What is the molar mass of Prozac? 1) 40.06 g/mol 2) 262.0 g/mol 3) 309.4 g/mol Learning Check

12. 12 Prozac, C 17 H 18 F 3 NO, is an antidepressant that inhibits the uptake of serotonin by the brain. What is the molar mass of Prozac? 3) 309.3 g/mol 17C (12.01) + 18H (1.008) + 3F (19.00) + 1N (14.01) + 1 O (16.00) = 204.2 +18.14 + 57.00 + 14.01 + 16.00 = 309.4 g/mol Solution