Write answer to the following question and explain your answer.
Explain with examples what is meant by a 'mole' of a substance .
One mole is defined as the amount of substance containing as many elementary entities (atoms, molecules, ions, electrons, radicals, etc.) as there are atoms in 12 grams of carbon-12 (6.023 x 1023).
The mass of one mole of a substance equals to its relative molecular mass expressed in grams. Mole defines the quantity of a substance. One mole of any substance will always contain 6.022 × 1023 particles, no matter what that substance is. Therefore, we can say:
- 1 mole of potassium atoms (K) contains 6.022 × 1023 potassium atoms.
- 1 mole of potassium ions (K+) contains 6.022 × 1023 potassium ions.
- 1 mole of hydrogen atoms (H) contains 6.022 × 1023 hydrogen atoms.
- 1 mole of hydrogen molecules (H2) contains 6.022 × 1023 hydrogen molecules.