E. 25

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Juliet Cushing_2H
Posts: 103
Joined: Wed Sep 30, 2020 9:39 pm

E. 25

Postby Juliet Cushing_2H » Tue Oct 06, 2020 1:15 pm

I'm confused by the wording of this question: (a) Determine the number of KNO3 formula units in 0.750 mol KNO3. Could someone explain what a formula unit is and how to find it? When I looked it up online the definition said "empirical formula" which is why I'm confused. Thanks!

Posts: 67
Joined: Wed Sep 30, 2020 10:02 pm

Re: E. 25

Postby Claire_Kim_2F » Tue Oct 06, 2020 1:18 pm

A formula unit is in a sense the chemical compound it seems with the least amount of elements so I thought of it as the simplest chemical compound and minimum number of elements in it. So it can also be called the empirical formula.

Kareena Patel 1G
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Re: E. 25

Postby Kareena Patel 1G » Tue Oct 06, 2020 2:19 pm

To solve this problem, you would convert the 0.75 moles of KNO3 to atoms using Avogadro's number. So (0.75 moles of KNO3)(6.02x10^23 atoms/mole) = 4.52 x 10^23 atoms.

Kayko Lee 1C
Posts: 112
Joined: Wed Sep 30, 2020 9:39 pm

Re: E. 25

Postby Kayko Lee 1C » Tue Oct 06, 2020 2:40 pm

I think of formula units just as if they were atoms so I would solve this problem just as if you were solving for atoms. You'll get the same answer except you would be in formula units instead of atoms, so I would just multiply the given mols by Avogadro's number and you'll have the solution in formula units

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