What is the SI unit for the amount of substance?

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Detailed Solution

The SI unit for the amount of substance is the mole (mol). One mole represents 6.022 × 10²³ particles of a substance, known as Avogadro’s number.

In chemistry, measuring the number of atoms or molecules directly is difficult. The mole was introduced as a standard unit to simplify this process. For example, 1 mole of water contains 6.022 × 10²³ molecules of H₂O.

Symbol: mol
Definition: Amount of substance containing as many particles as there are atoms in 12 g of carbon-12.
Use: Counting atoms, molecules, ions in chemical reactions.

Example

1 mole of NaCl = 6.022 × 10²³ molecules of sodium chloride.

Thus, the mole is a fundamental SI unit that helps chemists calculate and balance equations with accuracy.

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