
Percent Composition in Chemical Compounds
Interactive Video
•
Chemistry
•
9th - 10th Grade
•
Hard

Ethan Morris
FREE Resource
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7 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the first step in finding the percent composition of an element in a compound?
Divide the atomic mass by the number of atoms.
Multiply the molar mass by the number of atoms.
Subtract the atomic mass from the molar mass.
Add the atomic mass to the molar mass.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you calculate the percent composition of hydrogen in H2O2?
Add the atomic mass of hydrogen to the molar mass of H2O2.
Divide the atomic mass of hydrogen by 2 and multiply by the molar mass of H2O2.
Multiply the atomic mass of hydrogen by 2 and divide by the molar mass of H2O2.
Multiply the atomic mass of hydrogen by 4 and divide by the molar mass of H2O2.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the percent composition of hydrogen in H2O2?
3.02%
10.88%
5.94%
7.12%
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What should you do after calculating the molar mass of oxygen for percent composition?
Divide by the molar mass of H2O2 and multiply by 100.
Divide by the molar mass of water.
Multiply by the number of hydrogen atoms.
Add the molar mass of hydrogen.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the percent composition of oxygen in H2O2?
85.94%
75.00%
94.06%
50.00%
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why should the percent compositions of all elements in a compound add up to 100%?
To ensure the calculation is correct.
To verify the atomic mass.
To confirm the number of atoms.
To check the periodic table values.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the total percent composition of hydrogen and oxygen in H2O2?
100.00%
95.00%
99.00%
105.00%
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