
Unit 5 Moles and Molar Mass
Flashcard
•
Chemistry
•
10th - 11th Grade
•
Practice Problem
•
Hard
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1.
FLASHCARD QUESTION
Front
What is a mole in chemistry?
Back
A mole is a unit of measurement used to express amounts of a chemical substance. It is defined as the amount of substance that contains as many entities (atoms, molecules, etc.) as there are in 12 grams of carbon-12.
2.
FLASHCARD QUESTION
Front
How do you calculate the number of moles from grams?
Back
Number of moles = mass (g) / molar mass (g/mol).
3.
FLASHCARD QUESTION
Front
What is molar mass?
Back
Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all atoms in a molecule.
4.
FLASHCARD QUESTION
Front
How many moles are in 98.3 grams of aluminum hydroxide, Al(OH)3?
Back
1.26 moles.
5.
FLASHCARD QUESTION
Front
How do you convert atoms to moles?
Back
To convert atoms to moles, use the formula: Number of moles = number of atoms / Avogadro's number (6.022 x 10^23).
6.
FLASHCARD QUESTION
Front
How many moles are in 5.11 x 10^23 atoms of lithium (Li)?
Back
0.849 moles.
7.
FLASHCARD QUESTION
Front
What is the formula to calculate mass from moles?
Back
Mass (g) = number of moles x molar mass (g/mol).
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