Chemistry
Worksheet : Ch. 10 : Test review
Name :
Date :
A. Mole - number of particle conversions. Show all work.
1. How many atoms are there in 20.00 moles of calcium?
2. How many molecules are there in 10.00 moles of disulfur trioxide?
26
3. How many moles are there in 5.04 x 10 atoms of zinc
28
4. How many moles are there in 3.06 x 10 unit formulas of tin (IV) chloride
C. Mole-mass conversions. Show all work.
5. How many grams are there in 8.50 moles of nickel?
6. What is the mass of 6.40 moles of copper(II)chloride?
7. What is the mass of 7.50 moles of disulfur trioxide?
8. How many moles are there in 200.00 g of lead(II) phosphate?
9. How many moles are there in 560.00 g of disulfur pentaoxide?
D. More complex problems (Show all work):
10. How many atoms of fluorine are there in 4.50 moles of aluminum fluoride?
11. How many grams of carbon are there in 10.00 moles of glucose(C6H12O6)?
12. How many atoms of hydrogen are there in 25.00 grams of glucose(C6H12O6)?
E. Gas problems :
13. What is the volume of 5.66 moles of oxygen (O2) at STP?
14. How many moles of neon gas (at STP)will be needed to fill a neon sign which has a volume of
25 000.00 L?
15. A gas consisting of only oxygen atoms has a density of 2.143 g/L. Is this gas oxygen(O2) or ozone (O3) ?
F. Percent composition problems :
16. What is the percent composition of a compound which consists of 107.95 g of oxygen, 6.82 g of hydrogen and
135.23 g of calcium?
17. What is the percent composition of cobalt(II) hydroxide?
G. Calculation of empirical and molecular formulas.
18. What is the empirical formula of a compound which is 57.19% sulfur and 42.81% oxygen?
19. What is the molecular formula of the above compound if it has a gmm of 224.24 g?
20. Caffeine is 49.5% C, 5.15% H, 28.9% N and 16.5% O by mass. It has a gram molecular mass of about 195
g/mol. What are the empirical and molecular formulas of caffeine?
21. Ibuprofen is a pain and antiinflammatoiry medication. It is 75.69% carbon, 8.80% hydrogen, and the rest is
oxygen. It has a gram molecular mass of about 206 g/mol. What are the empirical and molecular formulas of
ibuprofen?
25
24
2
Answers ; 1. 1.20 x 10 atoms Ca 2. 6.02 x 10 molecules disulfur
3. 8.37 x 10 moles Zn
4.
4
2
5.08 x 10 moles tin (IV) chloride(SnCl4)
5. 499 g Ni
6. 8.60 x 10 grams 7. 841 g 8. 0.24645
24
2
moles Pb3(PO4)2
9. 3.8851 moles of S2O5
10. 8.13 x 10 atoms F 11. 7.206 x 10 g Carbon
24
12. 1.00 x 10 atoms H 13. 127 L oxygen
14. 1120 moles hydrogen
15. 48.0 g/mole= ozone
16. 43.180% O, 2.73% H and 54.090% Ca
17. 63.40% Co, 34.43% O and 2.17% H 18. S2O3 19.
S4O6 20. C4H5N2O , C8H10N4O2 21. C13H18O2