Forumula Units?

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Forumula Units?

Postby inlovewithchemistry » Sun Oct 07, 2018 7:42 pm

I'm a little bit confused on when to use formula units, atoms, or molecules. How do you know which one to use and when? Are there certain compounds specific to each one? I came upon this question when doing question 9E in the 7th edition book.
Thank you!

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Re: Forumula Units?

Postby Meachelle_Lum_1I » Sun Oct 07, 2018 7:49 pm

Hi! I think the difference in units just depends on the number of elements given.
When figuring out whether to use atoms/molecules in your answer, it depends on whether or not there's one element given (ex: Hydrogen) or more than one element given (H2O). I believe we refer to atoms if there is just one element, and molecules when there is more than one element.
Also, I believe formula units is the same thing as referring to number of atoms.

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Re: Forumula Units?

Postby jessicahe4Elavelle » Sun Oct 07, 2018 8:11 pm

I think that formula units and molecules are pretty much interchangeable, but formula units refer to ionic compounds like NaCl while molecules refer to molecular compounds. Atoms, instead, are used for single elements or ions.

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