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### Avogadro's Constant Definition

Posted: Sun Oct 07, 2018 6:28 pm
When it comes to di/tri/etc molecules, does Avogadro's constant apply? Or is it atom and not number of particles?

### Re: Avogadro's Constant Definition

Posted: Sun Oct 07, 2018 7:26 pm
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.

### Re: Avogadro's Constant Definition

Posted: Sun Oct 07, 2018 9:01 pm
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?

### Re: Avogadro's Constant Definition

Posted: Sun Oct 07, 2018 11:00 pm
A mole of Cl2 refers to 6.02x10^23 molecules of Cl2. That means there would be 1.204x10^24 individual Cl atoms.

### Re: Avogadro's Constant Definition

Posted: Sun Oct 07, 2018 11:03 pm
@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.

### Re: Avogadro's Constant Definition

Posted: Mon Oct 08, 2018 8:59 pm
Avogadro's constant can be used as the number of particles per mole of a substance

### Re: Avogadro's Constant Definition

Posted: Sat Oct 13, 2018 8:21 pm
A mole of H2 would include 6.02x1023 molecules of H2. But that would mean twice that for number of atoms.

### Re: Avogadro's Constant Definition

Posted: Sat Oct 13, 2018 8:31 pm
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.