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Percent Composition Review

Total questions: 20

Worksheet time: 5hrs 0mins

Name
Class
Date
1.
What is the percent by mass of oxygen in MgO?
a)
20%
b)
40%
c)
50%
d)
60%
2.
What is the percent by mass of magnesium in MgO?
a)
20%
b)
40%
c)
50%
d)
60%
3.
What is the percent by mass of sodium in NaCl?
a)
39%
b)
61%
c)
35%
d)
65%
4.
What is the percent by mass of chlorine in NaCl?
a)
39%
b)
61%
c)
35%
d)
65%
5.
What is the percent by mass of fluorine in CaF2 (gram-formula mass = 78 g/mol)?
a)
24%
b)
49%
c)
51%
d)
65%
6.
What is the percent by mass of calcium in CaF2 (gram-formula mass = 78 g/mol)?
a)
24%
b)
49%
c)
51%
d)
65%
7.
What is the percent composition by mass of sulfur in the compound MgSO4 (gram formula mass = 120 g/mol)?
a)
20%
b)
27%
c)
46%
d)
53%
8.
What is the percent composition by mass of magnesium in the compound MgSO4 (gram formula mass = 120 g/mol)?
a)
20%
b)
27%
c)
46%
d)
53%
9.
What is the percent composition by mass of oxygen in the compound MgSO4 (gram formula mass = 120 g/mol)?
a)
20%
b)
27%
c)
46%
d)
53%
10.
In which compound is the percent composition by mass of Cl equal to 42%?
a)
HClO (gram formula mass = 52 g/mol)
b)
HClO2 (gram formula mass = 68 g/mol)
c)
HClO3 (gram formula mass = 84 g/mol)
d)
HClO4 (gram formula mass = 100 g/mol)
11.
What is the percent composition of Benzene, C6H6?
a)
C = 50%
H = 50%
b)
C = 85.7 %
H = 14.3%
c)
C = 92.2%
H = 7.8%
d)
C = 71.9%
H = 28.1%
12.
Find the percent composition of Cu2S?
a)
%Cu= 67.987 %S= 32.013
b)
%Cu= 79.854   %S= 20.145
c)
%Cu= 35.946   %S= 64.054
13.

Which element in the compound potassium cyanide, KCN, has a percent composition of 60.97%?

a)

K

b)

C

c)

N

d)

None of the above

14.

What percentage of the total atomic mass of magnesium bromide (MgBr2) is composed of magnesium?

a)

13%

b)

43%

c)

63%

d)

87%

15.

What answer choice best represents the percentage composition of oxygen in the compound magnesium chlorate?

a)

12.71%

b)

37.08%

c)

50.21%

d)

33.24%

e)

67.33%

16.

What answer choice best represents the percentage composition of beryllium in the compound beryllium cyanide?

a)

14.76%

b)

39.34%

c)

45.88%

d)

63.36%

e)

52.27%

17.

Ammonia, found in cleaning products, is a compound of nitrogen and hydrogen. If ammonia is 82.2 % nitrogen, what is the percentage of hydrogen?

a)

17.8 % hydrogen

b)

82.2 % hydrogen

c)

64.4 % hydrogen

d)

8.9 % hydrogen

18.

A 10.0 g piece of stainless steel is found to contain 10.1% manganese by mass. What is the mass percent of manganese in a 100.0 g piece of the same metal?

a)

10.1 %

b)

100.1 %

c)

1.01 %

d)

0.101 %

19.

An element sample is 44% Zinc. If the sample has a mass of 5.0 g, what the mass of the Zinc in the sample?

a)

5.0 g

b)

220 g

c)

2.2 g

d)

There is no Zinc

20.

A sample of a metal is 74% Aluminum. If the sample weighs 200 g, what is the mass of Aluminum in the sample?

a)

74 g

b)

200 g

c)

148 g

d)

100 g

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