Mole calculations
Flashcard
•
Chemistry
•
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 the amount of a 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
To calculate the number of moles from grams, use the formula: Moles = Mass (g) / Molar Mass (g/mol).
3.
FLASHCARD QUESTION
Front
What is the molar mass of Carbon (C)?
Back
The molar mass of Carbon (C) is approximately 12 g/mol.
4.
FLASHCARD QUESTION
Front
What is the molar mass of Ammonium Sulfide (NH4)2S?
Back
The molar mass of Ammonium Sulfide is approximately 68 g/mol.
5.
FLASHCARD QUESTION
Front
How many moles are in 48 g of Carbon?
Back
4 mol (calculated using the formula: Moles = 48 g / 12 g/mol).
6.
FLASHCARD QUESTION
Front
What is the molar mass of water (H2O)?
Back
The molar mass of water (H2O) is approximately 18 g/mol.
7.
FLASHCARD QUESTION
Front
How many grams are in 3 mol of Ammonium Sulfide?
Back
204 g (calculated using the formula: Mass = Moles x Molar Mass = 3 mol x 68 g/mol).
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