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

2. Moles vs. Molecules Mole – a counting unit equivalent to 6.02 x 10 23 particles of a substance Molecule – a group of two or more atoms held together by chemical bonds that together are neutral (All compounds are molecules, but not all molecules are compounds)

3. Avogadro’s Number Use to convert from moles to molecules If molecule is a single atom molecule go directly from moles to atoms If molecule is a multi-atom molecule convert from moles to molecules then from molecules to atoms

4. 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 ●

5. 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 ●

6. 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 ●

7. 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 ●