#### Transcript of Moles! Moles! Moles!

**Moles! Moles! Moles!**

**So What is a Mole?**

So... what does that mean?

When you go to the store, how do you buy eggs?

**WEIGHT**

Do a dozen eggs weight the same as a dozen feathers?

A mole is a really really really really big number. It is the exact number of atoms in exactly 12 grams of carbon-12.

So if you have...

1 pair of shoes, how many shoes do you have?

1 dozen apples, how many apples do you have?

A bakers dozen of bagels?

A gross of grapes?

A ream of paper?

A mole of moles?

**ATOMIC**

Take a look at the periodic table...

How much does a mole of carbon atoms weigh?

A mole of oxygen atoms?

A mole of aluminum atoms?

A mole of iron atoms?

How many atoms are in 183.84 grams of Tungsten?

Now how about...

How many eggs in 2 dozen? 3 dozen? 1/2 dozen?

How many atoms in 1 mole of carbon?

How many atoms in 1/2 mole of carbon?

**WEIGHT**

MOLECULAR

What is the molecular weight of NaCl?

Atomic Mass of Na: 22.99 g/mol

Atomic Mass of Cl: 35.45 g/mol

22.99 + 35.45 = 58.44 g/mol

What is the molecular weight of sucrose?

C H O

12 22 11

C: 12.01 x 12 = 144.12 g/mol

H: 1.01 x 22 = 22.22 g/mol

O: 16.00 x 11 = 176.00 g/mol

342.34 g/mol

The atomic weight tells you the mass of a mole of atoms of that element.

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