Mole Intro
September 22, 2014
The Mole
An Introduction into Mole Conversions
Sep 16­6:29 PM
The Mole
The MOLE (M) is the
amount of a substance
that contains as many
elementary entities as
there are atoms in exactly
12.00 grams of 12C
HELP!!!
1 Mole = Avogadro‛s # = 6.02 x 1023
Sep 16­6:29 PM
1
Mole Intro
September 22, 2014
The Mole
A mole is like a “dozen”
1 mole of ANYTHING = 6.02 x 1023 of what it is made up of
1 dozen apples = 12 apples
1 mole of apples = 6.02 x 1023 apples
1 dozen baseballs = 12 baseballs
1 mole of baseballs = 6.02 x 1023 baseballs
3 dozen muffins = (12x3) = 36 muffins
3 moles of muffins = (6.02 x 1023) x 3 = 1.81 x 1024
muffins
Sep 16­6:29 PM
1 MOLE
Carbon
Sep 16­6:29 PM
2
Mole Intro
September 22, 2014
Molar Mass
• Is the mass of 1 mole of a substance (in g)
• You get this number from the periodic table
• Examples:
> 1 mole Na = 23.0 g
> 1 mole C = 12.0 g
> 1 mole Li = 6.9 g
How many atoms in 1 mole of sulfur?
pull
Sep 16­6:29 PM
6.02 x 10
How many atoms in 1 mole of sodium?
pull
pull
What is the mass of 1 mole of sulfur atoms?
6.02 x 10
pull
What is the mass of 1 mole of sodium atoms?
pull
How many atoms in 1 mole of fluorine?
6.02 x 10
pull
What is the mass of 1 mole of fluorine atoms?
Jan 3­8:21 AM
3
Mole Intro
September 22, 2014
Mole Conversions
• Using simple equation triangles and proportions,
we can convert MOLES of a substance into
• Particles/Molecules/Atoms
• Grams
• And vise-versa….
Sep 16­6:29 PM
Summary Conversion Chart
Sep 16­6:29 PM
4
Mole Intro
September 22, 2014
Converting Between Moles & Molecules
• If we are given the # of moles (M), we can
determine the # of particles/molecules (m) &
vise-versa
• You must know how many particles are in a mole
• Avogadro‛s Number
• 6.022 x 1023 particles = 1 MOLE!
m = M x 6.022 x 1023
M = m ÷ 6.022 x 1023
Sep 16­6:29 PM
Question: How many molecules are in 0.7 Moles of
Oxygen?
molecules
Solution: # Moles × Avogadro‛s # = # molecules
0.7 M × 6.02 x 1023 = ___________
Sep 16­6:29 PM
5
Mole Intro
September 22, 2014
Example:
Converting Between Moles & Molecules
Question: How many molecules are in 0.7 Moles of
Oxygen?
Solution: YOU CAN ALSO SOLVE THIS BY
SETTING UP A PROPORTION!!
x molecules
0.7 Moles
=
6.02 x 1023 molecules
1 Mole
Now
what
Cross mulitply
and divide
Sep 16­6:29 PM
PROBLEMS TO TRY!!
pull
1. How many atoms in 2.65 Moles of carbon?
1.60 x 1024 atoms of C
pull
2. How many moles in 2.40×1024 molecules of oxygen?
Solution = .400 x 101 moles of oxygen
Jan 3­8:37 AM
6
Mole Intro
September 22, 2014
Converting Between Grams and Moles
• If we are given the # of grams, we can determine
the # of moles, & vise-versa
• In order to convert from one to the other you must
first have molar mass
g = M x g/M
M = g ÷ g/M
• You get the molar mass by looking up the element‛s
mass on the PERIODIC TABLE
Sep 16­6:29 PM
Ex: Converting Between Grams and Moles
Question: How many moles are in 22.0 g of
copper metal?
Copper's
Mass
Solution: Mass of substance ÷ Molar Mass = Moles
22.0 grams ÷ 63.5 g/M =
Sep 16­6:29 PM
7
Mole Intro
September 22, 2014
Example:
Converting Between Grams and Moles
Question: How many moles are in 22.0 g of copper
metal?
Solution: YOU CAN ALSO SOLVE IT BY
SETTING UP A PROPORTION!!
22.0 grams
x Moles
=
63.5 grams
1 Mole
Now
what
Cross mulitply
and divide
Sep 16­6:29 PM
PROBLEMS TO TRY!!
pull
1. How many moles is 165 g of oxygen?
10.3 moles of oxygen
pull
2. How many grams is 5.63 Moles of aluminum?
152 grams of aluminum
Jan 3­8:37 AM
8
Mole Intro
September 22, 2014
Sep 16­6:31 PM
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