Name_______________________________________Date________________________________Period____________
CHEMISTRY TEST REVIEW: THE MOLE
1. Define the following terms:
a. Mole: Unit used to measure the amount of a substance. Equal to 6.02 x 1023
b. Formula unit: 1 of 3 representative particles. Ionic compound
c. Avogadro’s number: 6.02 x 1023
d. Molar mass: The mass in grams of one mole of a pure substance
e. Molecule: 1 of 3 representative particles. Covalent compound
2. List the three types of representative particles, what they represent, and provide one example of each.
Representative Particle
What they represent
Example
Atom
Pure elements on the periodic table
Na
Formula Unit
For IONIC compounds
CO2, F2
Molecule
For COVALENT compounds
NaCl
3. Calculate the molar mass of each of the following:
SHOW ALL WORK IF YOU WANT ANY CREDIT!!!
REMEMBER!!! SYMBOL, SYMBOL, CHARGE, CHARGE, CROSS!
a. calcium oxide
b. CH4(CH3)2
CaO
56.1 g
46.0 g
d. potassium chloride
e. chloric acid
KCl
74.6 g
f. O2NC6H4OH
HClO3
84.5 g
g. Al2(SO4)3
139 g
1
149.0 g
f. sulfur dioxide
SO2
64.1 g
h. Antimony
342.3 g
4. Write the general setup for mole conversions
Given
c. (NH4)3PO4
Goal Unit
Given Unit
Sb
121.8 g
Write the relationships between moles, atoms/formula units/molecules, and grams below:
1 mole = ____6.02
Atoms
Molecules
x 1023_____________
Formula units
Write the STEPS for performing mole conversions below
= ____Molar Mass (grams)_________
(remember Thursday’s Warm-Up!!!):
STEP 1: Write out the information above
STEP 2: List the Given, Goal and Conversion Factor
STEP 3: Setup the problem:
Given
Goal Unit
1
Given Unit
STEP 4: Fill in the appropriate values for the conversion factor matching the unit with
the value
STEP 5: Solve the problem, multiplying across
5. Work the following problems:
and dividing down
REMEMBER TO SHOW ALL WORK AND INCLUDE UNITS FOR CREDIT!!!
a. How many atoms are in 0.96 moles of calcium?
0.96 moles
1
6.02 x 1023 atoms
1 mole
5.8 x 1023 atoms
b. How many moles are in 1.42 x 1017 molecules of oxygen gas?
1.42 x 1017 molecules
1
1 mole
6.02 x 1023 molecules
2.36 x 10-7 moles
c. What is the mass of 0.79 moles of copper II sulfate?
0.79 moles
1
159.6 grams
1 mole
126 grams
d. How many moles are in 350 grams of magnesium chloride?
350 grams
1
e.
95.3 grams
3.67 moles
How many formula units are in 268 grams of aluminum chloride
268 grams
1
f.
1 mole
6.02 x 1023 formula units
133.5 grams
1.21 x 1024 funits
How many grams are in 2.45 x 1025 atoms of lead?
2.45 x 1025 atoms
1
207.2 grams
6.02 x 1023 atoms
8433 grams