How many elementary entities are there in one mole?
Exactly 6.626 070 15 × 10⁻³⁴
Exactly 6.022 140 76 × 10²³✓Bonne réponse
Exactly as many atoms as there are in 12 grams of carbon 12
About 6.022 × 10²³, with the exact figure still being measured
Explication
The mole now contains an exact, defined number of entities, known as the Avogadro number. The link to 12 grams of carbon 12 was the old definition and is now an experimental result rather than a definition.