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Catalyst: Happy Wednesday!

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Which quantity is larger?

- 4.5 x 1034 or 6.5 x 1020
- 2.3 x 10-3 or 4.5 x 10-6
- 5000 or 5 x 105
- HW Due: Read textbook pp. 224-229
- Do problems: pp. 233 #1, 2, 4, 5, 6(a), 8(a)
- Tonight’s HW: Read textbook pp. 230, 236-240
- pp. 233 #6(b, c, d), 7(c), 8(b)
- Valence electron review worksheet!

I will be able to explain what a “mole” in chemistry means!

- Catalyst
- HW Review
- Intro to Molar Conversions Worksheet
- Exit Slip

1. A mole is the number of atoms in exactly 12 g of carbon-12.

2. There are 6.022 x 1023 particles in one mole. “Particles” refers to atoms, ions, or molecules.

- 1 mol of nickel(II) and 1 mol of nickel(III) both contain exactly 6.022 x 1023 ions.
- (This is like asking “which is heavier: 1 pound of feathers or a 1 pound brick?” They are both 1 pound! Similarly, 1 mol of anything always contains 6.022 x 1023 of whatever is being counted.)

- 1.11 mol Pt is more than 6.022 x 1023 atoms.
- (This is the same as asking whether 1.11 is more or less that 1.00 because 1.00 mol = 6.022 x 1023 particles. 1.11 is more than 1.00.)

- 6(a). 1.204 x 1024 ions Fe3+
- 8(a). 0.500 mol H2O
- We will work through how to answer these questions in today’s lesson!

- What is a mole, besides a small mammal or a growth on your body, and what is it good for, besides digging holes?
- Do all moles weigh the same amount?

Analogy: Think of the term dozen...

How many doughnuts are in a dozen?

How many eggs are in a dozen?

How many bricks are in a dozen?

How many ostriches are in a dozen?

Get Ready… You’ll know what a “MOLE” is soon

Notes: Introducing the Mole

- Atoms and molecules are too small to see
- We measure out atoms by using a number called the mole!!!!

- A mole is the number of atoms in 12 grams of carbon-12.
- There are 6.022 x 1023 atoms in 12 grams of carbon-12.
- 1 mole (mol) = 6.022 x 1023 particles.

A mole is very similar to a dozen. But instead of meaning 12 of something, it means

6.02 x 1023 of something.

6.02 x 1023 = 602,000,000,000,000,000,000,000

Or

Six hundred and two sextillion!

1 mole (mol) = 6.02 x 1023

This number is a constant.

The number of particles in 1 mole is called Avogadro’s Number!

6.02 x 1023

Avocado

Avogadro

So one mole of...

...doughnuts is 6.02 x 1023 doughnuts

... Ostriches is 6.02 x 1023 ostriches

...oxygen atoms is 6.02 x 1023 atoms of oxygen (O)

...oxygen molecules is 6.02 x 1023 molecules of oxygen (O2)

- 1 mole = 6.02 x 1023 particles
- 6.02 x 1023 is called Avogadro’s number
- The periodic table is based on the molar mass of carbon (C)

- Why is the mole useful to us as chemists??
- Make a dot on your paper with your pencil.
- Guess how many atoms of Carbon graphite are in that dot.
- 25 million atoms in that tiny dot!

- How many particles are in 1 mole?
- 6.02 x 1023

- How many atoms are in 1 mole of carbon?
- How many atoms are in 1 mole of sodium?
- How many atoms are in 1 mole of helium?
- How many ducks are in 1 mole of ducks?

MOLES

particles

6.02 x 1023

To convert from number of moles to number of particles, multiply the number of moles by the conversion factor:

6.022 x 1023

1 mol

- How many particles are in 2.00 moles?
- Multiply
2.00 mol x 6.022 x 1023 particles = 12.04 x 1023

1.00 mol

6.02 x 1023

To convert from number of particles to number of moles, multiply the number of moles by the conversion factor:

1 mol___

6.022 x 1023

- How many moles is 3.01 x 1022 atoms?
- Multiply
(3.01 x 1022atoms) x __1.00 mole = 0.5 x 10-1 mole

6.022 x 1023 atoms

Scientific notation… 0.5 x 10-1 mole = 5.0 x 10-2 mole

- Catalyst
- HW Review
- Intro to Molar Conversions Worksheet
- Exit Slip

- Draw the Lewis Dot structure for the molecule: HBr
- How many molecules of HBr are in 2.00 mole of HBr?
- Which has more atoms: A mole Platinum or a mole of tin?

- Since the Earth has a radius of about 6400 km, its volume is approximately 1021 m3. Since about 500 large grapefruit will fit in one cubic meter, it therefore follows that a mole of grapefruit would have approximately the same volume as the Earth.
- If you had exactly one mole of sheets of paper, you could make one million equal stacks from sea level on the earth that would pass the sun.
- If you had a mole of pennies, you could give out enough money to everyone in the world so that they could spend a million dollars every hour, day and night, for the rest of their lives.