You are holding a single grain of sand in your hand. Now imagine trying to count every grain of sand on a beach. The task seems impossible, doesn’t it?
Similarly, when dealing with atoms, molecules, or ions, particles so small that billions of them fit into a single drop of water, counting them individually is impractical.
Mole
The mole (mol) is the SI unit for the amount of substance, defined as $6.02 \times 10^{23}$ particles (atoms, molecules, or ions).
Think of it as the "chemist's dozen," but instead of 12, one mole contains 6.02 × 10²³ elementary entities. This number is known as the Avogadro constant ($N_A$).
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Paywall
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