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

Front

What is a mole used for?

Back

To measure the amount of atoms or molecules in a substance.

Front

Why is the mole used to measure the atom?

Back

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

Front

How can two dishes each containing 1 mole of solid substance have different masses?

Back

The two solids are different elements with different masses.

Front

What does one mole of a substance measure?

Back

The number of particles of that substance.

Front

How many atoms are in 1 mole of Carbon (C)?

Back

6.02 x 10^23.

Front

What is Avogadro's number?

Back

6.02 x 10^23, which is the number of particles in one mole.

Front

What is the relationship between moles and mass?

Back

The mass of a substance in grams is equal to the number of moles multiplied by the molar mass.

Front

What is molar mass?

Back

The mass of one mole of a substance, usually 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).

Front

What is the significance of the mole in chemistry?

Back

It provides a bridge between the atomic scale and the macroscopic scale, allowing chemists to count particles by weighing them.