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 of 1.75 moles of zinc?
#1 Answer:
2. How many carbon atoms are in a 0.125 gram sample of C
8
H
10
N
4
O
2
?
#2 Answer:
3. How many moles are there in 42.0 grams of aluminum?
#3 Answer:
4. What is the mass 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 10 21 atoms of iron?
#6 Answer:
7. How many copper ions are in 25.2 grams of Cu
3
(PO
3
)
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 C
6
H
4
Cl
2
contains 4.80 x 10 22 molecules. What is the mass of the sample?
#9 Answer:
10. How many liters would 2.50 x 10 27 molecules of sulfur trioxide gas occupy?
11. A sample of 8.50 grams of methyl alcohol, CH
3
OH, contains how many atoms of hydrogen?
#10 Answer:
#11 Answer:
Percent Composition
Show ALL WORK. Round all answers to hundredths place.
12. Determine % composition of oxygen in calcium hydroxide, Ca(OH)
2
.
13. Determine % composition of water in calcium chloride dihydrate.
14. Determine % composition of water in copper (II) sulfate pentahydrate.
15. Calculate the mass, in grams, of carbon in a 375 gram sample of sodium carbonate.
#12 Answer:
#13 Answer:
#14 Answer:
#15 Answer:
16. 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.
17. The molecular formula for glucose is C
6
H
12
O
6
, what is its empirical formula? _______________
18. A sample of a brown-black compound is composed of 2.477 g manganese and 1.323 g oxygen. What is the empirical formula of the compound?
#18 Answer:
19. Xylene, a solvent used in industry, has the empirical formula of C
4
H
5
. The molar mass of xylene is
106.2 grams/mol. What is the molecular formula for xylene?
#19 Answer:
20. 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 62.1 g/mol.
#20 Answer:
21. Calculate the molecular formula of a compound that is 40.68% C, 5.12% H and 54.2% O. The molar mass of the compound is 118.1 grams.
#21 Answer:

Hydrates
Show ALL WORK.
22. A sample of iron (II) chloride hydrate was heated during a lab and the following data was collected:
Test tube
Test tube and hydrate
Test tube and anhydrate
Mass (grams)
24.82
272.25
182.42
Determine the formula of the hydrate.
#22 Answer:
23. If 165.49 grams of an unknown Na
2
S
2
O
3
hydrate are heated and 105.29 grams of anhydrate remain after all of the water has been driven off. What is the formula of this hydrate?
#23 Answer: