1. Molar Mass and Molar Conversions Chapter 3 part III

2. Mole One mole 6.02 X 10 23 p/mol Aka the chemists’ dozen.

3. One mole of each element has a different mass.

4. Why do they have a different mass? Different atoms have different masses.

5. AMU vs Molar Mass The atomic mass of an atom is equal to the weight of one mole of that element in grams/mole.

6. Molar Mass Ionic: Gram Formula Unit Covalent: Molecular Mass

7. Examples: Find the molar mass of different elements. He Na F Answer 4.00 g/mol 22.99 g/mol 19.00 g/mol

8. To calculate the molar Mass of compounds You add up the molar mass of each element found in the compound. Example: CO 2 The subscript is for the O. One Carbon = 12.01 g/mol Two Oxygens = 2(16.00 g/mol) = 32.00 g/mol Total is 44.01 g/mol

9. Molar Mass of Compounds Find the molar mass of the following compounds. CO 2 : 44 g/mol Ferrous Oxide:104 g/mol Carbonic Acid: 62 g/mol

10. Now you try! Worksheet