It’s time to learn about . . .
My new book on GOLF will give
the reader valuable playing tips
and insider information I've
gained through my years of
lessons, struggles and
experiments.
Here are just a few of the
chapter titles:
Chapter 2 - How to Hit a Nike from the
Rough, when you Hit a Titleist from the
Tee.
Chapter 18 - When to Regrip Your Ball
Retriever.
Stoichiometry: Introduction
At the conclusion of our time together,
you should be able to:
1.
2.
3.
4.
Explain what stoichiometry is
Define what a mole is
Describe how the mole was discovered
Convert a mole of a chemical into its molar
mass
STOICHIOMETRY
- the study of the
quantitative
aspects of
chemical
reactions.
STOICHIOMETRY
Composition Stoichiometry
2. Reaction Stoichiometry
3. Molar Ratio
1.
The Mole is the Quantity We Use in
Stoichiometry
6.02 X 1023
The Mole
A counting unit
 Similar to a dozen, except instead of 12, it’s
602 billion trillion
602,000,000,000,000,000,000,000
 6.02 X 1023 (in scientific notation)
 This number is named in honor of Amedeo
Avogadro (1776 – 1856), who studied
quantities of gases and discovered that no
matter what the gas was, there were the same
number of molecules present

Just How Big is a Mole?
Enough soft drink cans to cover the surface
of the earth to a depth of over 200 miles.
 If you had Avogadro's number of unpopped
popcorn kernels, and spread them across the
United States of America, the country
would be covered in popcorn to a depth of
over 9 miles.
 If we were able to count atoms at the rate of
10 million per second, it would take about 2
billion years to count the atoms in one
mole.

Everybody Has Avogadro’s Number!
But Where Did it Come From?
It was NOT just picked! It
was MEASURED.
 One of the better methods
of measuring this number
was the Millikan Oil Drop
Experiment
 Since then we have found
even better ways of
measuring using x-ray
technology

Avogadro asked . . .
Q: If ONE Hydrogen atom
masses at 1.008 amu’s,
how many Hydrogen atoms
would it take to mass at 1.008
grams ?
1
H
1.008
Answer: 6.023 x 1023
 that many
602,300,000,000,000,000,000,000
Here’s Another Way of Looking at the
Mole…
Suppose we invented a new collection unit
called a toburen. One toburen contains 8
objects.
1. How many paper clips in 1 toburen?
a) 1
b) 4
c) 8
2. How many oranges in 2.0 toburens?
a) 4.0
b) 8.0
c) 16
3. How many toburens contain 40 gummy
bears?
a) 5
b) 10
c) 20
The Mole is just Another Counting Unit


1 dozen cookies = 12 cookies
1 mole of cookies = 6.02 X 1023 cookies


1 dozen cars = 12 cars
1 mole of cars = 6.02 X 1023 cars


1 dozen Al atoms = 12 Al atoms
1 mole of Al atoms = 6.02 X 1023 atoms
Note that the mole NUMBER is always the same,
but the mole MASS is very different!
Mole is abbreviated mol
(gee, that’s a lot quicker to write, huh?)
Septic Tank Humor
A Mole of Particles
Contains 6.02 x 1023 Particles
1 mole C
= 6.02 x 1023 C atoms
1 mole H2O
= 6.02 x 1023 H2O molecules
1 mole NaCl
= 6.02 x 1023 NaCl “formula
units”
6.02 x 1023 Na+ ions and
6.02 x 1023 Cl– ions
Red-Neck Innovations:
Q: If ONE Sodium atom masses at 22.99
amu,
how many Sodium atoms would it take to
mass at 22.99 grams ?
11
Na
22.990
What does one Mole of Lithium atoms
mass at?
What does one Mole of Carbon atoms
mass at?
What does one Mole of O2 molecules
mass at?
What does one Mole of Water
molecules mass at?
Molar Mass

The Mass of 1 mole (in grams)

Equal to the numerical value of the average
atomic mass (use your periodic table, round
to 2 places)
1 mole of C atoms
=
12.01 g
1 mole of Mg atoms
=
24.31 g
1 mole of Cu atoms
=
63.55 g
Molar Mass of Molecules and
Compounds
Mass in grams of 1 mole is equal numerically to
the sum of the atomic masses
1 mole of CaCl2
=
1 mole Ca x 40.08 g/mol
+ 2 moles Cl x 35.45 g/mol
=
110.98 g/mol CaCl2
1 mole of N2O4
=
92.02 g/mol N2O4
I wonder if he ducked fast enough??
Stoichiometry: Introduction
Let’s see if you can:
1.
2.
3.
4.
Explain what stoichiometry is
Define what a mole is
Describe how the mole was discovered
Convert a mole of a chemical into its molar
mass
What Is The Difference
Between a Harley And
a Hoover?
The Location Of The Dirt Bag.
STOICHIOMETRY
- the study of the
quantitative
aspects of
chemical
reactions.
The Mole is the Quantity We Use in
Stoichiometry
6.02 X 1023
The Mole
A counting unit
 Similar to a dozen, except instead of 12, it’s
602 billion trillion
602,000,000,000,000,000,000,000
 6.02 X 1023 (in scientific notation)
 This number is named in honor of Amedeo
Avogadro (1776 – 1856), who studied
quantities of gases and discovered that no
matter what the gas was, there were the same
number of molecules present

Avogadro asked . . .
Q: If ONE Hydrogen atom
masses at 1.008 amu’s,
how many Hydrogen atoms
would it take to mass at 1.008
grams ?
1
H
1.008
Learning Check!
Find the mole (molar) mass
(round to the hundreths place)
A. 1 mole of Br atoms
B. 1 mole of Sn atoms
=
=
79.90 g/mole
118.71 g/mole
The End!!