Moles

THE MOLE

The MOLE is a measurement for the AMOUNT OF SUBSTANCE of a chemical.

The units for moles is simply: mol.

Definition:

ONE MOLE of any substance has the same number of PARTICLES as AVOGADRO’S CONSTANT.

The value for AVOGADRO’S CONSTANT is 6.02 x 10²³ per mole.

The PARTICLES mentioned in this definition can be ATOMS, MOLECULES, IONS and even ELECTRONS.

ONE MOLE of any substance has the SAME MASS in grams as its own RELATIVE FORMULA MASS (M_r).

For Example:

Formula:

The number of moles can be calculated using the formula:

CALCULATING MOLES FROM MASS

To find the number of moles of a compound from its mass, simply DIVIDE the mass by the compound’s M_r.

Here are some more examples to try:

CALCULATING MASS FROM MOLES

To calculate the mass of a substance from its moles, you can rearrange the formula. This means you can MULTIPLY the moles by the M_r.

Here are some more examples to try: