Chemistry Review
Flashcard
•
Chemistry
•
10th Grade
•
Practice Problem
•
Hard
Wayground Content
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15 questions
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1.
FLASHCARD QUESTION
Front
What is an empirical formula?
Back
An empirical formula is the simplest whole-number ratio of moles of elements in a compound.
2.
FLASHCARD QUESTION
Front
How do you calculate the percent composition by mass of an element in a compound?
Back
Percent composition by mass = (mass of element in 1 mole of compound / molar mass of compound) x 100%.
3.
FLASHCARD QUESTION
Front
What is the percent composition by mass of sulfur (S) in MgSO4?
Back
26.64%.
4.
FLASHCARD QUESTION
Front
What is the molecular formula for glycerol with a molar mass of 92.09 g/mol and percent composition of 39.12% C, 8.75% H, and 51.12% O?
Back
C3H8O3.
5.
FLASHCARD QUESTION
Front
What is the empirical formula for a compound with 81.82% carbon and 18.18% hydrogen?
Back
C3H8.
6.
FLASHCARD QUESTION
Front
How do you determine the empirical formula from percent composition?
Back
Convert percent to grams, then to moles, and find the simplest whole-number ratio.
7.
FLASHCARD QUESTION
Front
What is the formula for calculating molar mass?
Back
Molar mass = sum of the atomic masses of all atoms in a molecule.
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