SCH 4C
The Mole Introduced
We frequently refer to common measures casually...
Couple means ______ Few means ______ Dozen means ______ Baker’s Dozen means ______
Ream means ______
LORD means ______
1 Mole means ________________________________
The symbol for mole is: ______ and the unit for mole is ______
A mole can be anything….eggs, particles, molecules, atoms, formula units, etc.
In chemistry, 1 mole refers to specific particles. The name of the particle depends on the identity of the
substance.
Molecules – _____________________ bonded compounds. Usually a _____________________ and a
_____________________.
The _____________________ of water is the particle that is counted.
Therefore 1 mole of water has 6.02 X 1023 _____________________.
Formula Units - _____________________ bonded compounds. Usually a _____________________ and
a _____________________.
The _____________________ of salt is the particle that is counted.
Therefore 1 mole of water has 6.02 X 1023 _____________________.
Atoms - _____________________. Found on the _____________________ but are not part of
_____________________ (the diatomic gases).
The _____________________ of copper is the particle that is counted.
Therefore 1 mole of copper has 6.02 X 1023 _____________________.
Pop Quiz. Identify the unit for each substance.
Methane (CH4)
Magnesium chloride
Aluminum
Butane (C4H10)
Hydrogen peroxide
Sodium nitrate
Calcium
Mole to Particle Calculations
A calculation line is useful when dealing with moles.
MOLES
Example 1: There are 0.50 mol of methane, CH4 in a flask. How many molecules are present?
Example 2: How many molecules are found in 1.25 mol of CO2?
Example 3: How many moles are found in 5.83 x 1024 molecules of CO2?
Example 4: How many moles are found in 3.57 x 1025 atoms of zinc?
Practice:
1. Determine the number of representative particles in each of the following. Show your work.
A. 0.250 mol silver
B. 8.56 x 10-3 mol NaCl
C. 35.4 mol CO2
D. 0.425 mol N2
2 . Determine the number of moles in each of the following. Show your work.
A. 3.25 x 1020 atoms Pb
B. 4.96 x 1024 molecules glucose
C. 1.56 x 1023 formula units NaOH
D. 1.25 x 1025 Cu2+ ions
3. Make the following conversions. Show your work.
A. 1.51 x 1015 atoms Si to mol Si
B. 4.25 x 10-2 mol NO2 to molecules NO2
C. 8.95 x 1025 molecules CCl4 to mol CCl4
D. 5.90 mol Ca to atoms Ca