The Mole

1
The Mole
-just as a _____ is always ____, a _______ is
always _______, a ______ is always ____, and a
_____ is always ____, a _____ is always
____________________________, or __________, and
just like it is sometimes easier to buy things
by the _______ or by the _____, it is sometimes
easier to consider numbers of _________ of
_______ by the _____
pair
two
dozen
twelve
gross
144
ream
500
mole
602,000,000,000,000,000,000,000
6.02 x 1023
dozen
ream
particles
matter
mole
I. Converting Moles to Particles and Particles
to Moles
How do we simplify when we multiply fractions?
3
__
8
__
24
2
__
__
x


4
9
36
3
3
__
8
__
2
__
1
2
x
or

4
9
3
3
1
How many eggs in 4½ dozen?
12 eggs
4.5 dozen
x
________

54 eggs
1 dozen
conversion factor
2
The Mole
I. Converting Moles to Particles and Particles
to Moles
How many molecules in 4.5 moles of sucrose?
2 significant figures
6.02 x 1023 molecules sucrose
4.5 moles sucrose
x
_________________________

2.7 x 1024 molecules sucrose
1 mole sucrose
2 significant figures
2 significant figures
conversion factor
How many moles in 1.75 x 1025 molecules of water?
3 significant figures
1 mole H2O
_________________________
1.75 x 1025 molecules H2O
x

29.1 moles H2O
6.02 x 1023 molecules H2O
3 significant figures
3 significant figures