1. The MOLE! No, not the animal…Yes, this is chemistry

2. Know your targets! Students should be able to… – Determine the molar mass of an element or compound – Use the factor-label method to convert between: Moles Mass Number of atoms or molecules Volume of a gas

3. A What?!? A mole is a unit!

4. A “mole” is a unit How many is a dozen? 12 How many is a baker’s dozen? 13 How many is a couple? 2 How many is a few? 3 or 4 How many is a decade? 10 How many is a mole?...the number of particles (TBA) within a mole is always the same regardless of the type of substance

5. When do we use moles? The Fed-Ex Story – Moral? The Chuck E Cheese Story – Moral?

6. Molar Mass Molar mass is the mass of one mole of any element or compound. The molar mass for elements is found by looking at the atomic masses on the Periodic Table. The units for molar mass are “grams per mole”

7. Compare Aluminum and Gold Aluminum (Al)Gold (Au) Molar Mass= 27.0 g/molMolar Mass= 197.0

8. Molar Mass for Compounds Molar Masses are equal to the sums of the molar masses of all atoms in one molecule of that chemical compound Ex. NaCl Contains one atom of sodium and one atom of chlorine. (1 atom x 23.0 g/mole Na) + (1 atom x 35.5 g/mole Cl) = 58.5 g/mole NaCl

9. Molar Mass for Compounds A chemical formula with a subscript: Multiply the atoms of anything next to the subscript by the number of the subscript Ex. FeCl 2 contains one atom of iron and 2 of chlorine (1 atom x 56 g/mole Fe) + (2 atoms x 35.5 g/mole of Cl) = 127 g/mole of FeCl 2

10. Molar Mass for Compounds Other compounds: Ex. Zn(NO 3 ) 2 Zn + NO 3 + NO 3 Zn + N + O + O + O + N + O + O + O Contains one zinc atom, two nitrogen atoms, and six oxygen atoms (1 atom x 65 g/mole of Zn) + (2 atoms x 14 g/mole of N) + (6 atoms x 16 g/mole of O) = 189 grams/mole of zinc nitrate N N O O N N O O O O O O O O O O

11. Molar Mass: Your Turn 1.Li 2.KOH 3.BF 3 4.Mg(OH) 2 5.H 3 PO 4 6.(NH 4 ) 2 SO 4

12. Molar Mass: Answers 1.6.9 g/mol 2.56.1 g/mol 3.67.8 g/mol 4.58.3 g/mol 5.98.0 g/mol 6.132.1 g/mol