Chemistry10.1
10.1
The Mole: A Measurement of Matter

You could measure the
amount of sand in a sand
sculpture by counting
each grain of sand, but it
would be much easier to
weigh the sand. You’ll
discover how chemists
measure the amount of a
substance using a unit
called a mole, which
relates the number of
particles to the mass.
10.1
Measuring Matter
 Measuring
Matter
–What are three methods for
measuring the amount of
something?
10.1
Measuring Matter
 You
often measure the amount of
something by one of three different
methods—by count, by mass, and by
volume.
10.1
10.1
10.1
10.1
for Sample Problem 10.1
Problem Solving 10.1 Solve
Problem 1 with the help of an
interactive guided tutorial.
Sample problem 10.1



We are solving mass of 0.50 bushels of apples
We know: 0.20 bushels = 1 dozen apples
1 dozen apples = 2.0 kg
 Answer:

0.50 bushel x 1 dozen__

0.20 bushel

= 5.0 kg
x
2.0kg__
1 dozen
10.1
 What
is a mole?
10.1
What is a Mole?
 What
Is a Mole?
– How is Avogadro’s number related to a
mole of any substance?
10.1
What is a Mole?
A
mole of any substance contains
Avogadro’s number of
representative particles, or
6.02  1023 representative
particles.
–The term representative particle
refers to the species present in a
substance: usually atoms,
molecules, or formula units.
10.1
What is a Mole?
– Converting Number of Particles to Moles
One mole (mol) of a substance is
6.02  1023 representative particles of
that substance and is the SI unit for
measuring the amount of a
substance.
The number of representative
particles in a mole, 6.02  1023, is
called Avogadro’s number.
10.1
What is a Mole?
10.2
10.2
10.2
10.2
for Sample Problem 10.2
Problem Solving 10.4 Solve
Problem 4 with the help of an
interactive guided tutorial.
10.1
What is a Mole?
– Converting Moles to Number of Particles
Sample problem 10.2
?

Moles is 2.17x1023 particles of Br
We know 1 mole = 6.02x1023
 Answer:

2.17x1023 X 1 mole
6.02x1023
= 0.360mol Br
10.3
10.3
10.3
10.3
for Sample Problem 10.3
Problem Solving 10.5 Solve
Problem 5 with the help of an
interactive guided tutorial.
Sample problem 10.3







We are looking for the # of atoms in 1.14 mol SO3
We know there are 4 molecules in SO3
We know 1 mole of SO3 is 6.02x1023 moles
Answer:
1.14 mol X 6.02x1023 mol X 4 atoms
mol
molecule
= 2.75x1024
10.1
The Mass of a Mole of an
Element
 The
Mass of a Mole of an Element
– How is the atomic mass of an element
related to the molar mass of an
element?
10.1
The Mass of a Mole of an
Element
The
atomic mass of an
element expressed in grams
is the mass of a mole of the
element.
–The mass of a mole of an
element is its molar mass.
10.1
The Mass of a Mole of an
Element
 One
molar mass of carbon, sulfur, mercury,
and iron are shown.
Animation 11
– Animation 11
– Find out how Avogadro’s number is
based on the relationship between the
amu and the gram.
The Mass of a Mole of an
Element
10.1
10.1
The Mass of a Mole of a
Compound
 The
Mass of a Mole of a
Compound
–How is the mass of a mole of a
compound calculated?
10.1
The Mass of a Mole of a
Compound
–To calculate the molar mass of a
compound, find the number of
grams of each element in one mole
of the compound. Then add the
masses of the elements in the
compound.
10.1
The Mass of a Mole of a
Compound
 Substitute
the unit grams for atomic mass
units. Thus 1 mol of SO3 has a mass of 80.1
g.
10.1
The Mass of a Mole of a Compound
 Molar
Masses of Glucose, Water, and
Paradichlorobenzene
10.4
10.4
10.4
10.4
for Sample Problem 10.4
Problem Solving 10.7 Solve
Problem 7 with the help of an
interactive guided tutorial.
END OF SHOW