What is a mole in chemistry?
Moles

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Chemistry
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11th - 12th Grade
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Hard
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1.
FLASHCARD QUESTION
Front
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, ions, etc.) as there are in 12 grams of carbon-12.
2.
FLASHCARD QUESTION
Front
How do you calculate the number of moles from mass?
Back
Number of moles = mass (g) / molar mass (g/mol).
3.
FLASHCARD QUESTION
Front
What is the molar mass of a compound?
Back
The molar mass of a compound is the mass of one mole of that compound, calculated by summing the atomic masses of all the atoms in its chemical formula.
4.
FLASHCARD QUESTION
Front
How many molecules are in one mole of a substance?
Back
One mole of any substance contains approximately 6.022 x 10^23 molecules, known as Avogadro's number.
5.
FLASHCARD QUESTION
Front
What is the empirical formula?
Back
The empirical formula is the simplest whole-number ratio of atoms of each element in a compound.
6.
FLASHCARD QUESTION
Front
How do you determine the empirical formula from mass percentages?
Back
Convert mass percentages to grams, then to moles, and find the simplest ratio of moles of each element.
7.
FLASHCARD QUESTION
Front
What is the difference between empirical and molecular formulas?
Back
The empirical formula shows the simplest ratio of elements, while the molecular formula shows the actual number of atoms of each element in a molecule.
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