Name ______________________________________________ Date __________________ Period _____
Chemical Quantities – Review Sheet
Mole Conversions
Use dimensional analysis to solve each of the following problems. Show ALL work and round all answers to the correct
number of significant figures. All answers must have a UNIT and FORMULA.
1. What is the mass, in grams, of 1.75 moles of zinc?
#1 Answer:
2. How many molecules of C8H10N4O2 are in a 0.125 gram sample of C8H10N4O2?
#2 Answer:
3. How many moles are there in 42.0 grams of aluminum?
#3 Answer:
4. What is the mass, in grams, of 6.75 moles of fluorine gas?
#4 Answer:
5. How many molecules are there in 1.50 moles of carbon tetrachloride?
#5 Answer:
6. How many moles of iron are there in 7.50 x 1021 atoms of iron?
#6 Answer:
7. How many moles of Cu3(PO3)2 are in 25.2 grams of Cu3(PO3)2?
#7 Answer:
8. A sample of aluminum sulfate has a mass of 15.0 grams. What is the number of
formula units in the sample?
#8 Answer:
9. A sample of C6H4Cl2 contains 4.80 x 1022 molecules. What is the mass, in grams, of the sample?
#9 Answer:
10. How many liters would 2.50 x 1027 molecules of sulfur trioxide gas occupy?
#10 Answer:
11. A sample of 8.50 grams of methyl alcohol, CH3OH, contains how many molecules
of methyl alcohol? The molar mass of methyl alcohol is 32.042 g/mol.
#11 Answer:
Percent Composition
Show ALL WORK, including equations. Round all answers to correctly.
12. Determine % composition of oxygen in calcium hydroxide, Ca(OH)2.
#12 Answer:
13. Determine % composition of chlorine in potassium chlorate, KClO3.
#13 Answer:
14. Determine % composition of copper in copper (II) sulfate, CuSO4.
#14 Answer:
15. Which of the following compounds has the highest percent composition of oxygen?
a. Silver sulfate
b. Acetic acid
c. Tin(IV) chlorate
Empirical and Molecular Formulas
Show ALL WORK.
16. The molecular formula for glucose is C6H12O6, what is its empirical formula?
_______________
17. A sample of a brown-black compound is composed of 2.477 g manganese and 1.083 g oxygen. What is the
empirical formula of the compound?
#17 Answer:
18. Xylene, a solvent used in industry, has the empirical formula of C4H5. The molar mass of xylene is
106.168 grams/mol. What is the molecular formula for xylene?
#18 Answer:
19. Determine the empirical and molecular formulas for ethylene glycol if it is 38.7% C, 9.70% H and 51.6% O.
The molar mass of ethylene glycol is 62.068 g/mol.
#19 Answer:
20. Calculate the empirical and molecular formula of a compound that is 40.68% C, 5.12% H and 54.2% O. The
molar mass of the compound is 118.088 g/mol.
#20 Answer: