The Mole

I. Molar Conversions

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!

Molar ConversionsConverting from moles to grams to representative particles and vice versa. Use the following conversion factor:

1 mole = 6.02 x 1023 representative units = molar mass (g) or formula weight

Representative units -a. ionic compounds are called formula unitsb. molecular compounds are called moleculesc. atoms are called atoms.

Example of representative units - 6.02 x 1023 atoms Cu 6.02 x 1023 molecules O2

6.02 x 1023 units NaCl

Molar Conversion Examples How many moles of carbon are

in 26.0 g of carbon?

26.0 g C 1 mol C

12.0 g C= 2.17 mol C

Molar Conversion Examples How many molecules are in

2.50 moles of C12H22O11?

2.50 mol C12H22O11

6.02 1023

molecules

1 mol C12H22O11

= 1.51 1024

molecules C12H22O11

Molar Conversion Examples Find the mass of 2.1 1024

formula units of NaHCO3.

2.1 1024

units NaHCO3 84.0 g NaHCO3

6.02 1023

units NaHCO3

= 290 g NaHCO3

Molar Conversion Examples Find the number of units of Iron

(III) Chlorate in of 98.6 g of Iron (III) Chlorate.

98.6 gFe(ClO3)3

6.02 x 1023

units Fe(ClO3)3

306.3 gFe(ClO3)3

= 1.94 x 1023 units Fe(ClO3)3