1. Chem-To-Go Lesson 24 Unit 6 DEFINING AND CALCULATING THE MOLE You’ll want a periodic table and a calculator!

2.  A metric base unit  Defined in 3 ways  Represents a specific number  Dozen = 12  Pair = 2  Mole = 6.02x10 23  A very LARGE number because atoms are very small WHAT IS A MOLE?

3. DEFINING THE MOLE 1.Counting particles in a sample 2.Weighing a sample 3.Measuring the volume of a gaseous sample

4. Avogadro’s # Molar Mass Molar Volume Atomic Mass CONVERSION FACTORS!

5.  Aluminum (Al) is often used for structures such as high-quality bicycle frames. Compute the number of moles in a 10.0-g sample of aluminum. USING MOLAR MASS

6.  If a scientist uses 0.5 moles of Mg, how many atoms of Mg did she use? USING AVOGADRO’S NUMBER

7.  During cellular respiration, a cell releases 0.25 mol of O 2 gas. A container of what volume is needed to hold this gas? USING MOLAR VOLUME

8.  Calculate the number of formula units in a 45.0 gram sample of FeO. APPLYING ALL NECESSARY DEFINITIONS

9. See you in class!