Avogadro's Constant Definition

[Madelyn Romberg 1H]

When it comes to di/tri/etc molecules, does Avogadro's constant apply? Or is it atom and not number of particles?

[Michael Torres 4I]

Avogadro's constant still applies. For example, in chlorine gas (Cl2), there are 6.022 * 10^23 molecules of Cl2 per mol. Avogadro's constant can refer to the number of atoms, molecules, or formula units depending on the substance in question.

[804994652]

I have a similar question. Sometimes questions ask for atoms of Cl2. Does this mean the individual atoms (6.02x10^23) or is it referring to the number of Cl2 atoms in a compound like ZnCl2 has 1 atom of Cl2?

[Nell Mitchell 1E]

A mole of Cl2 refers to 6.02x10^23 molecules of Cl2. That means there would be 1.204x10^24 individual Cl atoms.

[Michael Nirula]

@804994652 Answering your question, those questions should be asking "how many molecules of Cl2" because Cl2 is a molecule not a singular atom. But, maybe if they were asking about how many atoms are in Cl2, you would answer 2 in that case.

[Lia Inadomi 1I]

Avogadro's constant can be used as the number of particles per mole of a substance

[Aili Ye 4L]

A mole of H₂ would include 6.02x10²³ molecules of H₂. But that would mean twice that for number of atoms.

[ElliotPourdavoud 1A]

Avogadro's constant will apply to molecules as well as individual elements it is a mol of the molecule or a mol of the atom.