Defining and Calculating the Mole

1. Defining and Calculating the Mole Chem-To-Go Lesson 24 Unit 6 You’ll want a periodic table and a calculator!

2. WHAT IS A MOLE? • A metric base unit • Defined in 3 ways • Represents a specific number • Dozen = 12 • Pair = 2 • Mole = 6.02x1023 • A very LARGE number because atoms are very small

3. Defining the Mole Counting particles in a sample Weighing a sample Measuring the volume of a gaseous sample

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

5. USING Molar mass • 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.

6. USING avogadro’s number • If a scientist uses 0.5 moles of Mg, how many atoms of Mg did she use?

7. USING Molar Volume • During cellular respiration, a cell releases 0.25 mol of O2 gas. A container of what volume is needed to hold this gas?

8. Applying all necessary definitions • Calculate the number of formula units in a 45.0 gram sample of FeO.

9. See you in class!