Mole Calculations Unit Test
1.
How many moles are in 325 grams of 6. If the empirical formula for a compound is
iron(III) sulfate, Fe (SO ) ?
NO and its molar mass is 92 g/mol, what is
the molecular formula?
2
4 3
A. 0.467 mol
A. NO
B. 0.812 mol
B. NO
C. 1.23 mol
C. N O
2
D. 2.14 mol
D. N O
2
2. How many grams are in 1 mole of
sulfuric acid (H SO )?
2
7. What would be the empirical formula of a
compound that is 25.5% carbon, 6.40%
hydrogen, and 68.1% oxygen?
A. 0.01 10 g
2
B. 0.02 10 g
A. CH O
C. 4.9 10 g
B. CH O
D. 9.8 10 g
C. C H O
D. C HO
4
11
3. What is the percent by mass of sulfur in
sulfur dioxide (SO )?
2
8. What is the percent composition of
strontium (Sr) in strontium carbonate solid
(SrCO (s))?
3
A. 25%
B. 33%
C. 50%
D. 67%
A. 1.68%
B. 20.0%
C. 56.3%
4. Which compound has the greatest
percent by mass of nitrogen?
A. NH
D. 59.4%
9. Carbon tetrachloride is a colorless liquid.
How many molecules are present in 6.32
g of the compound?
B. NF
C. NO
D. NO
A. 6.82 x 10 molecules
-26
B. 1.61 x 10 molecules
-21
5. Which represents an empirical formula?
C. 2.47 x 10 molecules
22
D. 5.85 x 10 molecules
26
A. C H O
6
12
B. N O
2
10. What is the percentage of water present in
nickel(II) chloride hexahydrate, NiCl 6H O?
2
C. H SO
2
D. P O
4
10
A. 7.58%
B. 13.9%
C. 45.5%
D. 83.4%
11. In an experiment, Guy gently heated a
hydrated copper compound to remove
the water of hydration. If the compound
originally weighed 1.72 g before heating
and weighed 1.12 g after heating, what
was the percentage of water in the
compound?
16. How many oxygen atoms are contained in
0.1 mole of iron (III) oxide, Fe O ?
2
A. 6.022 10 atoms
21
B. 6.022 10 atoms
22
C. 1.807 10 atoms
23
A. 34.9%
D. 1.807 10 atoms
24
B. 46.5%
C. 53.5%
17. What is mass of 3.0 moles of nitrogen gas
at STP?
D. 65.1%
A. 14 g
12. How many moles of CO are present in a
volume of 1.00 L at STP?
B. 28 g
C. 42 g
A. 0.0446 mol
D. 84 g
B. 0.224 mol
C. 22.4 mol
18. What is the percent composition of oxygen
in calcium nitrate, Ca(NO ) ?
3 2
D. 28.0 mol
A. 29.3%
13. What volume would a 10.0 mole sample
of helium gas occupy at STP?
B. 43.6%
C. 58.5%
A. 0.446 L
D. 87.2%
B. 4.46 L
C. 2.24 L
19. How many atoms are present in a 6.00 mol
sample of silver?
D. 224 L
A. 2.76 x 10 atoms
-25
14. Analysis of a 50-g sample of an unknown
compound shows that it contains 6.9 g of
potassium, 9.2 g of chromium, 11.3 g of
sulfur, and 22.6 g of oxygen. What
would be the empirical formula for this
compound?
B. 9.27 x 10 atoms
-3
C. 1.08 x 10 atoms
2
D. 3.61 x 10 atoms
24
A. KCrSO
B. KCrS O
2
20. How many moles are in 2.0 x 10 atoms of
carbon?
6
C. K Cr S O
2
14
D. K Cr S O
7
11
23
A. 2.8 x 10 mol
-19
15. What is the molar mass of vitamin A, a
fat-soluble vitamin? The molecular
formula of vitamin A is C H O.
20
30
B. 3.3 x 10 mol
-18
C. 3.0 x 10 mol
17
D. 3.6 x 10 mol
18
A. 29 g/mol
B. 51 g/mol
C. 270 g/mol
21. Which of the following electron
configurations represents an alkaline earth
metal?
D. 286 g/mol
A. [Ar] 4s
B. [Ar] 4s 3d
2
C. [Ar] 4s
D. [Ar] 3d 4s
10
22. Which of the following is false about the
molecule above?
A. As a liquid, It is soluble in water
B. It has a tetrahedral shape
C. It has a low boiling point
D. The IUPAC name is carbon
tetrahydride
23. The equation above is an example of
what type of reaction?
A. beta decay
B. nuclear fission
C. nuclear fusion
D. alpha decay
24. Which element in group 15 has the
greatest metallic character?
A. N
B. P
C. Sb
D. Bi
25. Which energy level would contain
electrons with the lowest energy?
A. n=1
B. n=2
C. n=5
D. n=7
Question
Answer
Standard
NCES.9_12.SC.CH.2.2.5
NCES.9_12.SC.CH.2.2.5
NCES.9_12.SC.CH.2.2.5
NCES.9_12.SC.CH.2.2.5
NCES.9_12.SC.CH.2.2.5
NCES.9_12.SC.CH.2.2.5
NCES.9_12.SC.CH.2.2.5
NCES.9_12.SC.CH.2.2.5
NCES.9_12.SC.CH.2.2.5
10
NCES.9_12.SC.CH.2.2.5
11
NCES.9_12.SC.CH.2.2.5
12
NCES.9_12.SC.CH.2.2.5
13
NCES.9_12.SC.CH.2.2.5
14
NCES.9_12.SC.CH.2.2.5
15
NCES.9_12.SC.CH.2.2.5
16
NCES.9_12.SC.CH.2.2.5
17
NCES.9_12.SC.CH.2.2.5
18
NCES.9_12.SC.CH.2.2.5
19
NCES.9_12.SC.CH.2.2.5
20
NCES.9_12.SC.CH.2.2.5
21
NCES.9_12.SC.CH.1.3.2
22
NCES.9_12.SC.CH.1.2.5
23
NCES.9_12.SC.CH.1.1.4
24
NCES.9_12.SC.CH.1.3.1
25
NCES.9_12.SC.CH.1.1.3
