Formula Units

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Robert Tran 1B
Posts: 118
Joined: Thu Jul 11, 2019 12:15 am

Formula Units

Postby Robert Tran 1B » Mon Sep 30, 2019 10:04 pm

Is there a difference between atoms/molecules and formula units? Do formula units change when an ionic compound is dissolved?

Jack Riley 4f
Posts: 100
Joined: Sat Aug 24, 2019 12:17 am

Re: Formula Units

Postby Jack Riley 4f » Mon Sep 30, 2019 10:14 pm

"Formula Units" and "Molecules" are basically the same thing. The only difference is that formula units refer to ionic compounds while molecules refer to covalently bonded elements.

Kishan Shah 2G
Posts: 132
Joined: Thu Jul 11, 2019 12:15 am

Re: Formula Units

Postby Kishan Shah 2G » Mon Sep 30, 2019 10:15 pm

I can give you a definitive answer to the first part of your question. Yes, formula units do mean the same thing as atoms. As for the second question, I would assume that formula units do not change for dissolved ionic compounds due to the fact that atoms are neither being created nor destroyed during this process. I could be wrong about this.

Chetas Holagunda 3H
Posts: 51
Joined: Thu Jul 11, 2019 12:17 am
Been upvoted: 1 time

Re: Formula Units

Postby Chetas Holagunda 3H » Mon Sep 30, 2019 10:16 pm

In terms of the problems we are solving, I think they are the same since they are considered the same in the textbook questions. One mole is 6.022X10^23 of anything, so in order to calculate, just use Avogadro's number to solve for either atoms or formula units.

britthanul234
Posts: 51
Joined: Wed Sep 18, 2019 12:21 am

Re: Formula Units

Postby britthanul234 » Tue Oct 01, 2019 8:25 am

Whenever a question asks you to find the formula units, it's simply asking you to find the number of atoms. So, if the question gives you the number of grams, divide it by the molar mass in order to figure out the number of moles. Then use Avogadro's number to find the number of atoms, which is the number of formula units.


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