What is percentage composition?
PERCENTAGE COMPOSITION

Quiz
•
Chemistry
•
9th Grade
•
Hard
Mae Racelis
Used 4+ times
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
The mass of a compound divided by its molar mass.
The ratio of the mass of each element in a compound to the total mass of the compound, expressed as a percentage.
The percentage of a compound that is composed of oxygen atoms.
The percentage of a compound that is composed of hydrogen atoms.
2.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
How is the percentage composition of a compound calculated?
By dividing the mass of a compound by its volume.
By dividing the mass of each element in the compound by the molar mass of the compound and multiplying by 100%.
By subtracting the mass of each element in the compound from the total mass of the compound.
By multiplying the mass of each element in the compound by the molar mass of the compound.
3.
MULTIPLE CHOICE QUESTION
1 min • 2 pts
What is the percentage composition of water (H2O)?
(Atomic mass: H=1, O=16)
11.11% hydrogen, 88.89% oxygen
50% hydrogen, 50% oxygen
33.33% hydrogen, 66.67% oxygen
20% hydrogen, 80% oxygen
4.
MULTIPLE CHOICE QUESTION
1 min • 2 pts
What is the percentage composition of carbon dioxide (CO2)?
(Atomic mass: C=12, O=16)
27.27% carbon, 72.73% oxygen
50% carbon, 50% oxygen
40% carbon, 60% oxygen
90% carbon, 10% oxygen
5.
MULTIPLE CHOICE QUESTION
1 min • 2 pts
What is the percentage composition of methane (CH4)?
(Atomic mass: C=12, H=1)
25% carbon, 75% hydrogen
50% carbon, 50% hydrogen
75% carbon, 25% hydrogen
90% carbon, 10% hydrogen
6.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
Which of the following represents the percentage composition of ammonia (NH3)?
16.67% nitrogen, 83.33% hydrogen
25% nitrogen, 75% hydrogen
82.35% nitrogen, 17.65% hydrogen
50% nitrogen, 50% hydrogen
7.
MULTIPLE CHOICE QUESTION
1 min • 2 pts
What is the percentage composition of sulfuric acid (H2SO4)?
(Atomic mass: H=1, S=32, O=16)
2.08% hydrogen, 32.65% sulfur, 65.27% oxygen
4.17% hydrogen, 32.65% sulfur, 63.18% oxygen
4.17% hydrogen, 65.27% sulfur, 30.56% oxygen
4.17% hydrogen, 16.33% sulfur, 79.50% oxygen
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