Percent Composition
Flashcard
•
Chemistry
•
9th Grade
•
Practice Problem
•
Hard
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1.
FLASHCARD QUESTION
Front
What is percent composition?
Back
Percent composition is the percentage by mass of each element in a compound.
2.
FLASHCARD QUESTION
Front
How do you calculate the percent composition of an element in a compound?
Back
Percent composition = (mass of element in 1 mole of compound / molar mass of compound) x 100%.
3.
FLASHCARD QUESTION
Front
What is the molar mass of MgO?
Back
Molar mass of MgO = 24.31 g/mol (Mg) + 16.00 g/mol (O) = 40.31 g/mol.
4.
FLASHCARD QUESTION
Front
What is the percent by mass of magnesium in MgO?
Back
Percent by mass of Mg = (24.31 g/mol / 40.31 g/mol) x 100% = 60%.
5.
FLASHCARD QUESTION
Front
What is the percent by mass of oxygen in MgO?
Back
Percent by mass of O = (16.00 g/mol / 40.31 g/mol) x 100% = 39.7% (approximately 40%).
6.
FLASHCARD QUESTION
Front
What is a cation?
Back
A cation is a positively charged ion formed when an atom loses one or more electrons.
7.
FLASHCARD QUESTION
Front
What is an anion?
Back
An anion is a negatively charged ion formed when an atom gains one or more electrons.
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