Determining the Number of Atoms for the Empirical Formula

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

Determining the Number of Atoms for the Empirical Formula

Postby Diviya Khullar 1G » Tue Oct 02, 2018 1:49 pm

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

Postby anishathomas » Tue Oct 02, 2018 2:00 pm

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

Postby Sydney Aurelio_Dis4B » Tue Oct 02, 2018 2:12 pm

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)


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