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Percent Composition
Test Description: This assessment will assess student's ability to calculate the percent composition of each element in a compound.
Instructions: Answer all questions to get your test result.
1) What is the percent composition for carbon and hydrogen in ethane, C2H6?
A
20% C and 60%H
B
80% C and 20% H
C
33% C and 66% H
D
20% C and 80% H
2) What is the percent composition for each element in sodium sulfate?
A
32% Na, 23% S, 45% O
B
23% Na, 32%S, 16%O
C
32% Na, 45% S, 23% O
D
23% Na, 45% S, 32% O
3) What is the percent composition for each element in ammonium sulfide?
A
12% N, 4% H, 28% S, 56% O
B
21% N, 6% H, 24% S, 48% O
C
28% N, 8% H, 64% S
D
14% N, 1% H, 32% S
4) What is the percent composition of each element in calcium phosphate?
A
40% Ca, 31% P, 16% O
B
22% Ca, 25% P, 53% O
C
39% Ca, 20% P, 41% O
D
30% Ca, 23% P, 47% O
5) What is the percent composition of each element in magnesium chloride?
A
50% Mg, 50% Cl
B
42% Mg, 58% Cl
C
59% Mg, 41% Cl
D
26% Mg, 74% Cl
6) What is the percent composition of calcium carbonate?
A
57% Ca, 9% C, 34% O
B
40% Ca, 12% C, 16% O
C
25% Ca, 15% C, 60% O
D
40% Ca, 12% C, 48% O
7) What is the percent composition for each element in ammonia?
A
14% N, 3% H
B
25% N, 75% H
C
82% N, 18 %H
D
50% N, 50% H
8) What is the percent composition for each element in water?
A
67% H, 33% O
B
2% H, 16% O
C
94% H, 6% O
D
6% H, 94% O
9) What is the percent composition of nitrogen in sodium nitride?
A
16.9%
B
64.6%
C
50%
D
83.1%
10) What is the percent oxygen in carbon monoxide?
A
50.0%
B
21.4%
C
57.1%
D
49.2%
*select an answer for all questions
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