The Mole and Avogadro's Number

Counting atoms in bulk — and why 6.022×10²³ matters.

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Overview

Atoms are so small that we count them in huge groups called moles. One mole contains 6.022 × 10²³ particles.

The mass of one mole of an element in grams equals its atomic mass in atomic mass units. So 1 mole of carbon weighs about 12 g.

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