The Mole Diagram
Objective: Learn how to use visual
aides to do conversions.
Think of the mole as
equal to two things
1.00 mole CO2 = _________ g CO2
1.00 mole CO2 = __________molecules
Now suppose you have 88.0 grams of CO2
Use the diagram to convert to molecules.
Now use the diagram to find the grams of CO2
in 3.0 x 1023 molecules of CO2
Set up a diagram to convert 30g of Sulfur
trioxide to molecules
30 grams to molecules
The mole is equal to three things
At STP one mole of any gas has a volume of
STP stands for Standard Temperature
T = 0o C or 273 K P = 1.0 atmosphere
14. 7 psi
The Volume of one mole of GAS is
equal to 22.4 liters @STP
The volume of one mole of iron is not equal to
22.4 liters @STP because iron is not a gas.
The volume of one mole of oxygen @STP is
equal to 22.4 liters because oxygen is a gas.
Pick the ones that have a molar
volume = 22.4 Liters
Which of the elements below would have a
molar volume equal to 22.4 liters @ STP?
Fe C N2 Cl2 S He
So a mole diagram for a gas looks like this
With one thing added
Use the diagram to find the volume of 7.0
grams of nitrogen
HW #20 Page 188
Calculate the molar mass for each of the following substances.
a. barium perchlorate d. copper(II) nitrate
b. magnesium sulfate e. tin(IV) chloride
c. lead(II) chloride f. phenol, C6H6O
Change the 49.2 mg to 49.2 grams.
SO3 = 80 grams for one mole.
(49.2/ 80) = 0.614 moles
Calculate the number of moles of the indicated substance
in each of the following samples.
a. 49.2 mg of sulfur trioxide
b. 7.44 104 kg of lead(IV) oxide
c. 59.1 g of chloroform, CHCl3
d. 3.27 g of trichloroethane, C2H3Cl3
e. 4.01 g of lithium hydroxide