1. Chapter 10: Chemical Quantities Mrs. Mansberger The Mole

2. What is a mole? 1 mole of a substance is 6.02 x 10 23 particles of that substance. 6.02 x 10 23 is known as Avogadro’s number

3. Converting Number of Particles to Moles How many moles of magnesium is 1.25 x 10 23 atoms of magnesium? 1.25 x 10 23 atoms Mg 1 mol Mg 6.02 x 10 23 atoms Mg = 2.08 x 10 -1 mol Mg = 0.208 mol Mg

4. Try this with your partner… How many moles is 2.80 x 10 24 atoms of silicon? 2.80 x 10 24 atoms Si 1 mol Si 6.02 x 10 23 atoms Si = 4.65 mol Si

5. Converting Moles to Number of Particles How many molecules are in 2.12 mol of propane (C 3 H 8 )? 2.12 mol C 3 H 8 6.02 x 10 23 molecules C 3 H 8 1 mol C 3 H 8 = 1.28 x 10 24 molecules C 3 H 8

6. Try this with your partner… How many molecules are in 4.8 moles of nitrogen dioxide (NO 2 )? 4.8 mol NO 2 6.02 x 10 23 molecules NO 2 1 mol NO 2 = 2.9 x 10 24 molecules NO 2