6.02 X 10 23 representative particles The Mole (also known as Avogadro’s number!)

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Presentation transcript:

6.02 X 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 H 2 O – 6.02 X molecules H 2 O 1 mole Fe – 6.02 X 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 (C 3 H 8 )? Known: # moles = 2.12 mol C 3 H 8 1 mol C 3 H 8 = 6.02 X molecules C 3 H 8 1 molecule = 11 atoms (3C + 8H) 2.12 mole C 3 H 8 1 mole C 3 H X molecules C 3 H 8 11 atoms 1 molecule C 3 H 8 = 1.40 X atoms

Try these: 1. How many atoms are in 1 mole of sucrose, C 12 H 22 O 11 ? 2. How many atoms of C are in 2 moles of C 12 H 22 O 11 ? 3. How many molecules are in 5 moles of C 12 H 22 O 11 ?

How big is a mole? What is the mass in kg of 6.02 X moles? (one mole weighs about 150 grams) 9.03 X 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 moles in km? (a mole is about 15 cm) 9.03 X 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 Mass The molar mass of a substance is the mass (in grams) of one mole of the substance. 1 mol C = grams1 mol He = grams 1 mol Ag = grams 1 mol Ca = ?? grams 1 mol CH 4 = grams1 mol H 2 O = grams 1 mol NaCl = grams1 mol SO 3 = ?? 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 = mol N 2 O 3 = 76.0 g 9.45 mol N 2 O 3 1 mol N 2 O grams = grams N 2 O 3

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) 2 3.How many grams are in 1.5 mol CO 2 ? 4.How many moles are in 92.2 g of Fe 2 O 3 ?