What is the formula to calculate the number of moles from the number of atoms?
U6 CP Chem % Comp, MM, Hydrates

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Chemistry
•
11th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
Number of moles = Number of atoms / Avogadro's Number (6.02 x 10^23)
2.
FLASHCARD QUESTION
Front
How do you determine the molar mass of a compound?
Back
Add the atomic masses of all the atoms in the compound's formula.
3.
FLASHCARD QUESTION
Front
What is Avogadro's Number?
Back
6.02 x 10^23, the number of atoms or molecules in one mole of a substance.
4.
FLASHCARD QUESTION
Front
How do you calculate percent composition of a compound?
Back
Percent composition = (mass of element in 1 mole of compound / molar mass of compound) x 100%.
5.
FLASHCARD QUESTION
Front
What is a hydrate?
Back
A compound that contains water molecules within its crystal structure.
6.
FLASHCARD QUESTION
Front
How do you find the formula of a hydrate?
Back
Determine the mass of water lost and the mass of the anhydrous compound, then calculate the ratio of moles of water to moles of the anhydrous compound.
7.
FLASHCARD QUESTION
Front
What is the molar mass of potassium hydroxide (KOH)?
Back
56 g/mol (K=39, O=16, H=1) => 39 + 16 + 1 = 56.
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