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Moles! Moles! Moles!

Moles and Molecular Weight
by

Mallory Welch

on 10 March 2014

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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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