Avogadro's Constant Definition

Moderators: Chem_Mod, Chem_Admin

Madelyn Romberg 3L
Posts: 29
Joined: Tue Oct 02, 2018 12:16 am

Avogadro's Constant Definition

Postby Madelyn Romberg 3L » 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?

Michael Torres 4I
Posts: 92
Joined: Thu May 10, 2018 3:00 am
Been upvoted: 1 time

Re: Avogadro's Constant Definition

Postby Michael Torres 4I » 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.

804994652
Posts: 68
Joined: Fri Sep 28, 2018 12:26 am

Re: Avogadro's Constant Definition

Postby 804994652 » 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?

Nell Mitchell 1E
Posts: 31
Joined: Fri Sep 28, 2018 12:16 am

Re: Avogadro's Constant Definition

Postby Nell Mitchell 1E » 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.

Michael Nirula
Posts: 32
Joined: Fri Sep 28, 2018 12:27 am

Re: Avogadro's Constant Definition

Postby Michael Nirula » 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.

Lia Inadomi 1I
Posts: 62
Joined: Fri Sep 28, 2018 12:15 am

Re: Avogadro's Constant Definition

Postby Lia Inadomi 1I » Mon Oct 08, 2018 8:59 pm

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

Aili Ye 4L
Posts: 58
Joined: Fri Sep 28, 2018 12:16 am

Re: Avogadro's Constant Definition

Postby Aili Ye 4L » 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.

ElliotPourdavoud 1A
Posts: 36
Joined: Fri Sep 28, 2018 12:16 am

Re: Avogadro's Constant Definition

Postby ElliotPourdavoud 1A » 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.


Return to “Accuracy, Precision, Mole, Other Definitions”

Who is online

Users browsing this forum: No registered users and 4 guests