Name _____________________________________________________
Date __________________________
Math and the Mole Review Packet
1. The formula mass measures the mass of _____________________ particle(s), and the units of
measurement are _____________________.
2. The gram formula mass measures the mass of _____________________ particle(s), and the
units of measurement are _____________________.
3. One mole is equal to _____________________ particles.
4. A _____________________ is an ionic compound with a fixed number of water molecules
attached to its structure. After the water is removed, all that is left is the ( dehydrated /
anhydrous ) salt.
5. A(n) _____________________ formula is the smallest whole number ratio of atoms in a
molecule or compound. A(n) _____________________ formula represents the actual number
of atoms in a molecule.
6. Write the empirical formulas for the following:
a) C3H12
b) Al2(SO4)3
c) CH4
d) C6H12O6
7. An unknown compound contains 40.50% zinc, 19.86% sulfur, and 39.64% oxygen.
Determine the empirical formula of the unknown compound.
8. Determine the percent composition of all of the elements in NaHCO3.
9. Vitamin C has an empirical formula of C2H4O3 and a molecular mass of 152 amu. What is
the molecular formula of vitamin C?
10. What is the percent composition of water in NiCl2 ∙ 6H2O?
11. Given the reaction 2 KClO3  2 KCl + 3 O2, how many moles of KClO3 are needed to
produce 6 moles of O2?
12. How many moles of oxygen are consumed in the production of 1 mole of Na2O in the
following reaction: 4 Na + O2  2 Na2O?
13. What is the total number of moles in 115 grams of C2H5OH?
14. Determine the mass of 4.76 moles of Al2(SO4)3.
15. How many moles of CO2 gas will fill up a 50 L container at STP?
16. Estradiol is a female steroid hormone with the molecular formula C 18H30O2. How many
moles would 7.64 x 1023 molecules of estradiol be?
Answer Key
1. one, amu
2. 6.02 x 1023, g/mole
3. 6.02 x 1023
4. hydrate, anhydrous
5. empirical, molecular
6. a) CH4
b) Al2(SO4)3
c) CH4
H: 1.2%
C: 14.3%
d) CH2O
7. ZnSO4
8. Na: 27.4%
9. C4H8O6
10. 45.4%
11. 4 moles
12. 0.5 moles
13. 2.5 moles
14. 1,629.3 g
15. 2.23 moles
16. 1.27 moles
O: 57.1%