Avagadro's number

AVOGADRO'S NUMBER

A mole is defined as the amount of substance that contains 6.023 × 10²³ particles. This experimentally determined value is called Avogadro's Number.

• The particles may be electrons, atoms, molecules, ions, or formula units.
• It links the microscopic world (atoms/molecules) to the macroscopic world (measurable substances).
• Avogadro's Number is denoted by N_A.
• 1 mole of any substance = 6.023 × 10²³ particles.

Examples:

• 1 mole of carbon contains 6.023 × 10²³ atoms of carbon.
• 1 mole of water contains 6.023 × 10²³ molecules of water.
• 1 mole of sodium chloride contains 6.023 × 10²³ formula units.
• 1 mole of sodium ions contains 6.023 × 10²³ sodium ions.

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