## When finding empirical formula

305174946
Posts: 61
Joined: Fri Sep 28, 2018 12:17 am

### When finding empirical formula

When beginning to find the empirical formula, do you always start with the mass percentage composition if it is not given?

Posts: 32
Joined: Fri Sep 28, 2018 12:23 am

### Re: When finding empirical formula

Yes, usually they give you the percent composition, but if it is not given, divide the mass given by the mass of the total compound to find percent composition.

AvaGordon_4F
Posts: 34
Joined: Fri Sep 28, 2018 12:25 am

### Re: When finding empirical formula

I believe so, yes! You need to calculate mass percentage composition and get a percentage for every element involved, because that is the crucial information you need to do the rest of the problem. Once you have that, you can proceed with solving the rest (by assuming you have 100 g of the compound, getting a relative mole ratio etc..)

Henry_Phan_4L
Posts: 68
Joined: Fri Sep 28, 2018 12:24 am

### Re: When finding empirical formula

Find the percent composition and then convert to moles.

michelle
Posts: 62
Joined: Fri Sep 28, 2018 12:23 am

### Re: When finding empirical formula

I think yes. Only in that way you could find the ratio of moles.