Percent composition practice

Flashcard
•
Science
•
9th - 12th Grade
•
Hard
Standards-aligned
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15 questions
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1.
FLASHCARD QUESTION
Front
What is percent composition in chemistry?
Back
Percent composition is the percentage by mass of each element in a compound, calculated by dividing the mass of each element by the total mass of the compound and multiplying by 100.
2.
FLASHCARD QUESTION
Front
How do you calculate the percent composition of an element in a compound?
Back
To calculate the percent composition of an element, use the formula: (mass of the element in 1 mole of the compound / molar mass of the compound) x 100.
3.
FLASHCARD QUESTION
Front
What is the percent composition by mass of magnesium in MgSO4?
Back
20%.
4.
FLASHCARD QUESTION
Front
What is the percent by mass of magnesium in MgO?
Back
60%.
Tags
NGSS.MS-PS1-1
5.
FLASHCARD QUESTION
Front
In the compound CO, which element has a greater percent composition by mass, carbon or oxygen?
Back
Oxygen.
Tags
NGSS.MS-PS1-1
6.
FLASHCARD QUESTION
Front
What is the percent composition of carbon and hydrogen in benzene (C6H6)?
Back
C = 92.2%; H = 7.8%.
7.
FLASHCARD QUESTION
Front
How do you find the molar mass of a compound?
Back
The molar mass of a compound is found by summing the atomic masses of all the atoms in its chemical formula.
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