Introduction – Mole Concept

What is a Mole?

One mole of a substance is the amount of it which contains as many elementary entities in exactly 12.0 grams of carbon-12.

From this definition, it means that a mole of an element is a collection of its atoms, such that the total mass in grams is numerically equal to its relative atomic mass.

The mole can also be defined as the amount of substance which contains Avogadro’s number of particles. The particles may be atoms, molecules, ions, electrons, protons, etc. hence, it is very necessary to state the type of particles involved.

The Avogadro’s number is a constant and the value is 6.02 × 10²³ atoms or ions or electrons or protons etc.

The mole can be expressed in the following ways:

1. Mole in terms of formula

2. Mole in terms of Relative Atomic Mass (R.A.M) or Relative Molar Mass (R.M.M)

3. Mole in terms of Avogadro’s number

4. Mole in terms of Molar volume