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Molar Conversions

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The Mole

Molar Conversions

VERY

A large amount!!!!

- A counting number (like a dozen)
- Avogadro’s number (NA)
- 1 mol = 6.02 1023 items

- One mole contains as many “entities” (things) as there are atoms in 12 grams of carbon-12.
- One mole of carbon-12 contains
6.02 x 1023 atoms of carbon-12.

HOW LARGE IS IT???

- 1 mole of pennies would cover the Earth 1/4 mile deep!

- 1 mole of hockey pucks would equal the mass of the moon!

- 1 mole of basketballs would fill a bag the size of the earth!

- Mass of 1 mole of an element or compound.
- Atomic mass tells the...
- atomic mass units per atom (amu)
- grams per mole (g/mol)

12.01 g/mol

26.98 g/mol

65.39 g/mol

- carbon
- aluminum
- zinc

- water
- sodium chloride

- H2O
- 2(1.01) + 16.00 = 18.02 g/mol
- NaCl
- 22.99 + 35.45 = 58.44 g/mol

- sodium bicarbonate
- sucrose

- NaHCO3
- 22.99 + 1.01 + 12.01 + 3(16.00) = 84.01 g/mol
- C12H22O11
- 12(12.01) + 22(1.01) + 11(16.00) = 342.34 g/mol

MASS

IN

GRAMS

MOLES

NUMBER

OF

PARTICLES

molar mass

6.02 1023

(g/mol)

(particles/mol)

- How many moles of carbon are in 26 g of carbon?

26 g C

1 mol C

12.01 g C

= 2.2 mol C

- How many moles of sodium chloride are in 26 g of sodium chloride?

26 g NaCl

1 mol NaCl

58.44 g NaCl

= 0.44 mol

NaCl

- How many moles of magnesium fluoride are in 85 g of MgF2?

85 g MgF2

1 mol MgF2

62.31 g MgF2

= 1.36 mol MgF2

MASS

IN

GRAMS

MOLES

NUMBER

OF

PARTICLES

molar mass

6.02 1023

(g/mol)

(particles/mol)

- How many molecules are in 2.50 moles of C12H22O11?

6.02 1023

molecules

1 mol

2.50 mol

= 1.51 1024

molecules

C12H22O11

- How many molecules are in 2.50 moles of C2H6?

6.02 1023

molecules

1 mol

2.50 mol

= 1.51 1024

molecules

C2H6

- Find the mass of 2.1 1024 molecules of NaHCO3.

2.1 1024

molecules

1 mol

6.02 1023

molecules

84.01 g

1 mol

= 290 g NaHCO3

- How many atoms are in 10 grams of NaCl.

1 mol

58.44 g NaCl

6.021023 atoms NaCl

1 mol

10 g NaCl

= 1.03x 1023 atoms NaCl

- Q: What did Avogadro teach his students in math class?

- Moletiplication

- A: Watermolens

- When they made him, they broke the Moled

Oil of Molay