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 amounts of a chemical substance, defined as containing exactly 6.02 x 10^23 particles (atoms, molecules, ions, etc.).

Front

What is Avogadro's Number?

Back

Avogadro's Number is 6.02 x 10^23, which is the number of particles in one mole of a substance.

Front

How can two substances each containing 1 mole have different masses?

Back

The two substances are different elements with different atomic masses.

Front

If you have one mole of tin (Sn), how many moles do you have if you double it?

Back

You would have two moles of tin (Sn).

Front

What is the relationship between a mole and a dozen?

Back

Both a mole and a dozen are units used to count particles; a dozen refers to 12 items, while a mole refers to 6.02 x 10^23 particles.

Front

What does a dozen measure?

Back

A dozen measures pieces or particles of items.

Front

What is the mass of one mole of carbon (C)?

Back

The mass of one mole of carbon is approximately 12.01 grams.

Front

What is the significance of the mole in chemical reactions?

Back

The mole allows chemists to count and measure substances in reactions, ensuring that reactants are combined in the correct proportions.

Front

How do you convert moles to grams?

Back

To convert moles to grams, multiply the number of moles by the molar mass of the substance (in grams per mole).

Front

What is the molar mass of water (H2O)?

Back

The molar mass of water is approximately 18.02 grams per mole.