I II III IV

The Mole

Molar Conversions

A. What is the Mole?

A counting number (like a dozen)

Avogadro’s number (NA)

1 mol = 6.02 1023 items

A large amount!!!!

This is the fundamental definition of what one mole

is: 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.

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

A. What is the Mole?

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

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

B. Molar Mass

Mass of 1 mole of an element or compound.

Atomic mass tells the... atomic mass units per atom (amu) grams per mole (g/mol)

B. Molar Mass Examples

carbon

aluminum

zinc

12.01 g/mol

26.98 g/mol

65.39 g/mol

B. Molar Mass Examples

water

sodium chloride

H2O

2(1.01) + 16.00 = 18.02 g/mol

NaCl 22.99 + 35.45 = 58.44 g/mol

B. Molar Mass Examples

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

Day 2

C. Molar Conversions

molar mass

(g/mol)

MASS

IN

GRAMS

MOLESNUMBER

OF

PARTICLES

6.02 1023

(particles/mol)

C. Molar Conversion Examples 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

C. Molar Conversion Examples 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

C. Molar Conversion Examples 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

Day 3

C. Molar Conversions

molar mass

(g/mol)

MASS

IN

GRAMS

MOLESNUMBER

OF

PARTICLES

6.02 1023

(particles/mol)

C. Molar Conversion Examples How many molecules are in

2.50 moles of C12H22O11?

2.50 mol6.02 1023

molecules

1 mol

= 1.51 1024

molecules C12H22O11

C. Molar Conversion Examples How many molecules are in

2.50 moles of C2H6?

2.50 mol6.02 1023

molecules

1 mol

= 1.51 1024

molecules C2H6

Day 4

C. Molar Conversion Examples Find the mass of 2.1 1024

molecules of NaHCO3.

2.1 1024

molecules 1 mol

6.02 1023

molecules

= 290 g NaHCO3

84.01 g

1 mol

C. Molar Conversion Examples

How many atoms are in 10 grams of NaCl.

10 g NaCl 1 mol

58.44 g NaCl

= 1.03x 1023 atoms NaCl

6.021023 atoms NaCl

1 mol

MOLE DAY FUNNIESQ: What did Avogadro teach his students in math class?

Moletiplication

Q: What kind of fruit did Avogadro eat in the summer?

A: Watermolens

Why was there only one Avogadro?

When they made him, they broke the Moled

What did Avogadro invent for his wife to use as a night cream?

Oil of Molay