## E. 25

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

### E. 25

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!

Claire_Kim_2F
Posts: 67
Joined: Wed Sep 30, 2020 10:02 pm

### Re: E. 25

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
Posts: 97
Joined: Wed Sep 30, 2020 9:58 pm
Been upvoted: 1 time

### Re: E. 25

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

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