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### Formula Units

Posted: Tue Oct 08, 2019 5:31 pm

### Re: Formula Units

Posted: Tue Oct 08, 2019 5:40 pm
A formula unit can be an atom, compound, or molecule. For example, if a question asks how many formula units of H2O are in one mole of H2O, then you would just find the number of atoms in one mole of H2O.

### Re: Formula Units

Posted: Tue Oct 08, 2019 5:42 pm
From what I know, formula units can be interchangably used with the number of molecules or atoms, so using Avogadro's number should work for any question asking for a compound's formula units. Something to keep in mind is that formula units usually refer to ionic compounds while molecules refer to molecular compounds.

### Re: Formula Units

Posted: Tue Oct 08, 2019 5:45 pm
A formula unit is the same as the empirical formula for an ionic compound (composed of cations and anions). They are written as formula units because they don't normally exist as individual molecules.

### Re: Formula Units

Posted: Tue Oct 08, 2019 6:41 pm
I think of it as the unit for compound.

### Re: Formula Units

Posted: Tue Oct 08, 2019 11:29 pm
Formula units can be an atom, compound, or a molecule. So basically you just have to use Avogadro's number to solve the equation.

### Re: Formula Units

Posted: Tue Oct 08, 2019 11:36 pm
It's used for conversion to atoms, compounds, and molecules.

### Re: Formula Units

Posted: Thu Oct 10, 2019 11:16 am
I had this question too, since the book used it in a confusing way. I asked my TA and he said that formula units is the empirical formula but for an ionic compound. However, since we don't need to know what an ionic compound is yet, when they ask for formula units they just means molecules.

### Re: Formula Units

Posted: Thu Oct 10, 2019 9:20 pm
Emily Vainberg 1L wrote:I had this question too, since the book used it in a confusing way. I asked my TA and he said that formula units is the empirical formula but for an ionic compound. However, since we don't need to know what an ionic compound is yet, when they ask for formula units they just means molecules.

Yeah, I was reading through the textbook and got confused when it was brought up. Thanks for the explanation!

### Re: Formula Units

Posted: Fri Oct 11, 2019 12:35 am
Formula units are basically the amount/number of something in a given bit of information. Formula units can be atoms or molecules. Basically, to find them you just need to multiple by Avogadro's number.

### Re: Formula Units

Posted: Fri Oct 11, 2019 1:12 am
Formula units are the amount of said material object, such as molecule, atom, compound, etc. The formula units are a quantitative measurement of the amount of any given thing.