1. The Mole

2. Atoms & molecules are extremely small The number of individual particles in even a small sample of something is very large Therefore, counting the number of particles is not a practical way to measure the sample. The Mole

3. A chemical counting unit (abbreviated “mol”) Similar to a dozen, except instead of 12, it’s 602 billion trillion 602,000,000,000,000,000,000,000 6.02 X 10 23 (in scientific notation) The Mole

4. 6.02 X 10 23 Amedeo AvogadroThis number is named in honor of Amedeo Avogadro, who studied quantities of gases and discovered that no matter what the gas was, there were the same number of molecules present in a constant volume of gas. The Mole That’s my number!

5. The term representative particle refers to the species present in a substance –Usually atoms or molecules The Mole

6. Using Avogadro’s Number 6.02 x 10 23 Use my number, I’m waiting...

7. What number of moles of Mg is equivalent to 1.806 x 10 24 atoms of Mg? *Remember* 1 mol Mg = 6.02x10 23 atoms Mg *Remember* 1 mol Mg = 6.02x10 23 atoms Mg 6.02x10 23 atoms Mg 1 mol Mg 1.806x10 24 atoms Mg = 3.0 moles ●

8. How many of moles of C 2 H 6 is 9.17 x 10 23 molecules of C 2 H 6 ? 1 mol C 2 H 6 = 6.02x10 23 molecules C 2 H 6 6.02x10 23 molecules C 2 H 6 1 mol C 2 H 6 9.17x10 23 molecules C 2 H 6 = 1.52 moles ●

9. If we had 2.5 moles of sugar, how many molecules of sugar is that equal to? *Remember* 1 mol sugar = 6.02x10 23 molecules sugar *Remember* 1 mol sugar = 6.02x10 23 molecules sugar 6.02x10 23 molecules sugar 1 mol sugar 2.5 mol sugar = = = 1.51x10 24 molecules of sugar = 1.51x10 24 molecules of sugar ●

10. How many atoms of gold are in 0.75 moles of gold? 1 mol gold = 6.02x10 23 atoms gold 6.02x10 23 atoms gold 1 mol gold 0.75 mol gold = = = 4.52x10 23 atoms of gold ●