## Determining the Number of Atoms for the Empirical Formula

Diviya Khullar 1G
Posts: 59
Joined: Fri Sep 28, 2018 12:19 am

### Determining the Number of Atoms for the Empirical Formula

Once you divide the each of the number of moles of each type of atom by the smallest value you usually get a whole number right away. But I was wondering what to do if you get a number that is slightly off, for example if you get 4.03 is it okay to use 4 for the number of atoms in the empirical formula? I know if you get 1.33, for example, you should multiply by 3 to get a whole, but in the case of a number like 4.03 it doesn't really make sense to multiply, so should I just use 4?

anishathomas
Posts: 35
Joined: Fri Sep 28, 2018 12:25 am

### Re: Determining the Number of Atoms for the Empirical Formula

Yeah if it’s very close to a whole number you don’t have to worry about it. 4.03 is close enough to 4!

Sydney Aurelio_Dis4B
Posts: 30
Joined: Fri Sep 28, 2018 12:28 am

### Re: Determining the Number of Atoms for the Empirical Formula

Yes, when a number can be rounded from the hundredth's place it is okay to round up or down to a whole number (ex: 4.03 can be rounded to 4, and 3.98 can be rounded to 4). However if a number can't be rounded from the hundredth's place to reach a whole number, then it should be multiplied by a factor to get the smallest whole number possible. (ex: 2.5 can't be rounded so you would multiply by a factor of 2 to get 5)