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The Mole

Mole concept and conversions

Antoinette Thompson

on 3 January 2013

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Transcript of The Mole

Counting in Chemistry The Mole: What do the following words have in common? dozen 12 things
pair 2 things
couple 2 things
ream 500 sheets How do we count atoms? Sometimes scientists need to be able to count
atoms or molecules...but, how can they do that when they can't even see what they want to count? Here comes the...mole? Through experiments with different gases, an Italian scientist named Amedeo Avogadro observed that equal volumes of different gases contained the same number of molecules.
Avogadro didn't find out the exact number, but other scientists eventually figured it out, and it was named Avogadro's number to honor Avogadro's contribution.
Avogadro's number and mole are the same number. But Mrs. Thompson...
What on earth is a mole? It's neither! What the mole represents Like the other words we saw, the mole represents a number, but what exactly is that number? 6.02x10 23 or 602,200,000,000,000,000,000,000 (Who wants to count all that?) Now that we know what the mole is, we can begin converting!
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