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

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

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

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 Ca g/mol g Cl g/mol g CaCl g

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 K g/mol g P g/mol g O g/mol g K 3 PO g

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

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

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

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) g/mol 2) g/mol 3) g/mol Learning Check

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) g/mol 17C (12.01) + 18H (1.008) + 3F (19.00) + 1N (14.01) + 1 O (16.00) = = g/mol Solution