1. Bell Work (08/31/17)
The mass of a lump of gummy bears is 350.8g. If each gummy bear weighs 3.7g, how many gummy bears are in the lump?
The mass of an aluminum cylinder is grams. If the mass of one aluminum atom is 4.48 x g, how many aluminum atoms are there in the cylinder?

2. Moles!!! August 31, 2017 Today’s Agenda: Bell Work/Word Wall
Isotopes and Atomic Mass
Exit Ticket
18. flammable: able to be ignited easily.

3. Counting Atoms and the Mole The Moley Mole!!!

4. Counting Atoms SI unit for an amount of substance is called mole.
A mole measures the number of particles within a substance.
A mole refers to a specific number of particles. (Counting Unit)
How many eggs are in a dozen?

5. 1 mole = 6.02 x 1023 particles (a particle can be anything)
6.02 x 1023 is also known as Avogadro’s Number
1 mole magnesium = x Mg atoms
1 mole zinc = x Zn atoms
1 mole lead = x Pb atoms
1 mole of Au = ?
1 mole of tacos = ?
1 mole of dollars = ?

6. Molar Mass
Although 1 mole always contains the same number of particles, the mass of one mole varies depending on the substance.
Molar Mass – mass of one mole of a substance.
Mass of one mole of an element is equal to its ATOMIC MASS expressed in grams.
1 mole of magnesium = grams
1 mole of zinc = grams
1 mole of lead = grams
1 mole of lead = grams

7. O Periodic Table Oxygen 8 Average Atomic Mass: Molar Mass:
Tells us BOTH the average mass of all isotopes(AMU) AND
Mass of 1 mole of the substance (g/mole)
15.999

8. Molar Mass What is the molar mass of oxygen?
g/mol or 16.0 g/mol
Rounding to the tenths place is the best practice.
What is the molar mass of sodium?
g/mol or 23.0 g/mol
What is the molar mass of Chlorine?
g/mol or 35.5 g/mol

9. Molar Mass
What is the molar mass of CO (Carbon Monoxide)? (I’ll help with this one. Look to the board and the answer shall appear!).
What is the molar mass of H2O? We’ll check it together.
Now it’s your turn! You have 5 minutes to complete these four problems. You must show your work to receive credit! At the end of class I’ll collect this sheet.
What is the molar mass of 𝐶 𝑂 2 ?
What is the molar mass of 2(𝑁𝑎𝑂𝐻)?
What is the molar mass of 𝐻 2 𝑆 𝑂 4 (Sulfuric Acid)?
What is the molar mass of glucose ( 𝐶 6 𝐻 12 𝑂 6 )?