Percent Composition by Mass Problems

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•
Chemistry
•
9th - 12th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
What is percent composition by mass?
Back
Percent composition by mass is the percentage by mass of each element in a compound, calculated by dividing the mass of the element by the total mass of the compound and multiplying by 100.
2.
FLASHCARD QUESTION
Front
How do you calculate the total mass of a compound?
Back
To calculate the total mass of a compound, sum the atomic masses of all the atoms present in the chemical formula.
3.
FLASHCARD QUESTION
Front
What is the formula for calculating percent composition by mass?
Back
Percent Composition = (Mass of Element / Total Mass of Compound) x 100.
4.
FLASHCARD QUESTION
Front
What is the percent composition by mass of sulfur in a compound containing 9.0 g of aluminum, 28.0 g of sulfur, and 64.0 g of oxygen?
Back
28%.
5.
FLASHCARD QUESTION
Front
If a compound contains 24 g of carbon, 4 g of hydrogen, and 32 g of oxygen, what is the percent composition by mass of hydrogen?
Back
7%.
6.
FLASHCARD QUESTION
Front
What is the percent composition by mass of carbon in carbon dioxide (CO₂)?
Back
27.3%.
7.
FLASHCARD QUESTION
Front
What is the percent composition by mass of nitrogen in ammonia (NH₃)?
Back
82.2%.
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