6.02 X 1023

representative particles

The Mole

(also known as Avogadro’s number!)

how big is a mole?

how high would a stack of 1 mol of paper be?

What do you call a tenth grader taking chemistry?

A sophmole!

how big is a mole?

who is the strongest person in class?

a mole of various substances

What’s a “representative particle”?

-the type of unit present in a substance:•atoms

•diatomic molecules

•molecules

Examples:

1 mole H2O – 6.02 X 1023 molecules H2O1 mole Fe – 6.02 X 1023 atoms Fe

On which American mountain was Avogadro’s face carved in stone?

Mt. Rushmole!

How many atoms are in 2.12 moles of propane (C3H8)?

Known: # moles = 2.12 mol C3H8

1 mol C3H8 = 6.02 X 1023 molecules C3H8

1 molecule = 11 atoms (3C + 8H)

2.12 mole C3H8

1 mole C3H8

6.02 X 1023

molecules C3H811 atoms

1 molecule C3H8

= 1.40 X 1025 atoms

Try these:

1. How many atoms are in 1 mole of sucrose, C12H22O11?

2. How many atoms of C are in 2 moles of C12H22O11?

3. How many molecules are in 5 moles of C12H22O11?

How big is a mole?

What is the mass in kg of 6.02 X 1023 moles? (one mole weighs about 150 grams)

9.03 X 1022 kg !!

That’s equal to:

•more than 1% of the earth’s mass!

•more than 1.3 times the moon’s mass!

•more than 60 times the combined mass of earth’s oceans!

What is the length of 6.02 X 1023 moles in km? (a mole is about 15 cm) 9.03 X 1019

km !!That’s equal to:

the distance from earth to Alpha Centauri and back!! Wow!

How did Avogadro get through the desert? He rode a camole!

Molar MassThe molar mass of a substance is the mass (in grams) of one mole of the substance.

1 mol C = 12.01 grams

1 mol He = 4.003 grams

1 mol Ag = 107.9 grams

1 mol Ca = ?? grams

1 mol CH4 = 16.04 grams

1 mol H2O = 18.01 grams

1 mol NaCl = 58.44 grams

1 mol SO3 = ?? grams

How much does Avogadro exaggerate?He makes mountains out of molehills!Let’s Practice!

How many grams are in 9.45 mol of dinitrogen trioxide?

Known: # mol = 9.45

1 mol N2O3 = 76.0 g9.45 mol N2O3

1 mol N2O3

76.0 grams= 718.2 grams N2O3

Try these!

1.Find the mass, in grams, of 3.32 mol K

2.Find the mass, in grams, of 2.5 mol Fe(OH)23.How many grams are in 1.5 mol CO2?

4.How many moles are in 92.2 g of Fe2O3?