What is a mole? (Unit 2, Lesson 26)

Front

What is a mole in chemistry?

Back

A mole is a unit of measurement used to express the amount of a substance, defined as 6.022 x 10^23 particles (atoms, molecules, ions, etc.).

Front

Why is the mole used to measure atoms?

Back

Atoms are extremely tiny particles, and their size varies from element to element.

Front

What does the mole measure?

Back

The mole measures the amount of atoms or molecules in a substance.

Front

Which unit is similar to the mole in terms of counting?

Back

A dozen is similar to the mole as it also represents a specific quantity (12 items).

Front

What does one mole of a substance represent?

Back

One mole represents the number of particles (atoms, molecules) in that substance.

Front

Why can two moles of different substances have different masses?

Back

The two substances can have different elements with different atomic masses.

Front

What is Avogadro's number?

Back

Avogadro's number is 6.022 x 10^23, which is the number of particles in one mole.

Front

How is the mole related to the mass of a substance?

Back

The mass of one mole of a substance (in grams) is numerically equal to its molar mass (in g/mol).

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).

Front

How do you calculate the number of moles from mass?

Back

Number of moles = mass (g) / molar mass (g/mol).