
Unit 6-Review The Mole
Flashcard
•
Chemistry
•
11th - 12th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is the percent by mass of oxygen in MgO?
Back
40%
2.
FLASHCARD QUESTION
Front
What is the percent by mass of potassium in KCl?
Back
52.7%
3.
FLASHCARD QUESTION
Front
What is an empirical formula?
Back
The simplest whole-number ratio of moles of elements in the compound.
4.
FLASHCARD QUESTION
Front
What is the mole used for?
Back
To measure the amount of atoms or molecules in a substance.
5.
FLASHCARD QUESTION
Front
How many moles are in 4.5x10^24 particles?
Back
7.48 mol.
6.
FLASHCARD QUESTION
Front
Define 'mole' in chemistry.
Back
A mole is a unit that measures the amount of substance, defined as containing exactly 6.022 x 10^23 particles.
7.
FLASHCARD QUESTION
Front
What is the formula to calculate percent by mass?
Back
(mass of element in 1 mole of compound / molar mass of compound) x 100.
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