Chapter 11
The Mole
http://www.angelfire.com/hi5/moleday0/moleday.html
11.1 Measuring Matter
Objectives
• Describe how a mole is used in chemistry
• Relate a mole to common counting units
• Convert moles to number of representative particles and
number of particles to moles
11.1 Measuring Matter
Vocabulary
 Mole
 Avogadro's
Number
11.1 - Measuring Matter
Matter is:
• Measured by mass, volume, or “counting” particles.
• All matter made of particles:
•
•
•
•
Atoms
Molecules
Ions
Formula units
Regardless of form, all will be called particles
What is a Mole?
http://ed.ted.com/lessons/daniel-dulek-howbig-is-a-mole-not-the-animal-the-other-one
• Mole- SI base unit used to measure
the amount of a substance
• Equal to the number of
representative particles (carbon
atoms) in exactly 12 grams of
carbon-12
ATOMS ARE SO SMALL THAT 1 MOLE OF THEM
WOULD FIT IN YOUR HAND!
• 1 mole carbon atoms
• 6.02 x 1023 atoms
• Mass of 12.0 grams
mole (mol)
• The amount of a compound or
element that contains 6.022 x
1023 of that substance.
• Called Avogadro’s number
• 1 mole = 1 molar mass = 6.02 x
1023 particles (atoms, molecules,
formula units)
• Basically, the molar mass is the
MASS of one MOLE of a
substance.
To comprehend the enormous size of Avogadro’s
number, 6.02 x 1023, here are some analogies:
• Would a mole of rice
grains fill our chemistry
lab?
• 1 mole of rice in grams
would cover all the land
area of the whole world to
a depth of 75 meters.
• 1 mole of rice has more
grains than the
number grains of all
grain grown since
the beginning of
time!
A MOLE IS A LOT OF THINGS!
• A mole of atoms are needed in order to
express to atomic mass in grams.
• Ex. Atomic mass of Al = 27 g.
• It would take 6.02 x 1023 atoms in order to
have 27 g of aluminum. (This would fit in
your hand).
CONVERTING MOLES  PARTICLES:


1 mole = 6.02 x 1023 particles
Conversions:

Convert to particles: x 6.02 x 1023 particles
1 mole
Convert to moles: x
1 mole
6.02 x 1023 particles

Conversion Flow Chart
Given:
Given:
Multiply by A.N.
Divide by A.N.
Molar Mass
QUIZ – THE MOLE
• 1) What is the SI unit for amount of matter?
• 2) How many particles are in 1 mole?
• This is called _____’s number.
• 3) Can 1 mole of M & M’s fit in your locker?
• 4) Can 1 mole of gold atoms fit in your locker?
• 5) Suppose you had 6.02 x 1023 atoms of silver. How
many moles?
• What is the mass?
Problems:
• 1) Find the number of atoms
in 3.60 mol of Zn.
• 2) How many formula units
in 4.50 mol of NaCl?
• 3) Calculate the number of
molecules in15.0 mol H2O.