Intro to The Mole Concept

Front

What is a mole in chemistry?

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, etc.) as there are in 12 grams of carbon-12.

Front

Why is the mole used to measure atoms?

Back

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

Front

How many atoms are in one mole of any substance?

Back

6.02 x 10^23 atoms.

Front

How many Carbon atoms are in 4 moles of Carbon?

Back

2.408 x 10^24 Carbon atoms.

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 do you calculate the number of atoms in moles?

Back

Multiply the number of moles by Avogadro's number (6.02 x 10^23).

Front

What is the mass of one mole of Carbon-12?

Back

12 grams.

Front

If you have 3 moles of an element, how many atoms do you have?

Back

Multiply 3 by Avogadro's number: 3 x (6.02 x 10^23) = 1.806 x 10^24 atoms.

Front

What does 3.01 x 10^23 atoms represent in moles?

Back

.5 mol = 1/2 of a mole.

Front

What is the relationship between moles and grams?

Back

The number of grams of a substance can be calculated by multiplying the number of moles by the molar mass of the substance.