1 mole of a substance is 602 x 10 23 representative particles Avogadros number 602 x 10 23 Avogadro determined the difference between atoms and particles Representative particle ID: 791285
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Slide1
The Mole
Thursday, 1/7
Slide2What is a mole?
1 mole of a substance is 6.02 x 10
23
representative particles
.
Avogadro’s number =
6.02 x 10
23
Avogadro determined the difference between atoms and particles.
Representative particle
: the “species” present in a substance (usually atoms, molecules or formula units)
Slide3Key Point!!!
A mole of any substance contains Avogadro’s number
of representative
particles, or
6.02
x 10
23
representative particles.
Practice
How many molecules are in one mole of Hydrogen?
How many atoms are in three moles of hydrogen?
Slide4Slide5Representative Particles and Moles
A mole of any substance contains Avogadro’s number of representative particles, or 6.02 x 10
23
representative particles.
Substance
Representative particle
Chemical
formula
Representative particles in 1.00 mole
Atomic nitrogen
Atom
N
6.02 x 10
23
Nitrogen gas
Molecule
N
2
6.02 x 10
23
Water
Molecule
H
2
O
6.02 x 10
23
Calcium ion
Ion
Ca
2+
6.02 x 10
23
Calcium
flouride
Formula
unit
CaF
2
6.02 x 10
23
Sucrose
Molecule
C
12
H
22
O
11
6.02 x 10
23
Slide6Atomic Mass
Atomic mass of an element (the mass of a single atom) is expressed in
atomic mass units (
amu
)
Atomic masses are relative values based on the mass of carbon-12
Slide7Molar Mass
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. Expressed in
grams per mole
(g/
mol
).
Slide8Slide9The 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.
Slide10The Molar Mass of Water
Slide11Molar Mass of a Compound
Find the molar mass of glucose (C
6
H
12
O
6
)
Slide12Magnesium is a light metal used in the manufacture of aircraft, automobile wheels, tools and garden furniture.
How
many moles of magnesium is 1.25 x 10
23
atoms of magnesium?
Converting # of Atoms to Moles
Slide13Propane is a gas used for cooking and heating.
How
many atoms are in 2.12
mol
of propane (C
3
H
8
)?
Converting Moles to Number of Atoms
Slide14Converting Moles to Mass
What is the mass of 9.45
mol
of aluminum oxide (Al
2
O
3
)?