When finding empirical formula

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

When finding empirical formula

Postby 305174946 » Fri Oct 05, 2018 11:45 am

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

Madison Gil 3D
Posts: 32
Joined: Fri Sep 28, 2018 12:23 am

Re: When finding empirical formula

Postby Madison Gil 3D » Fri Oct 05, 2018 11:52 am

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

Postby AvaGordon_4F » Fri Oct 05, 2018 11:55 am

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

Postby Henry_Phan_4L » Fri Oct 05, 2018 4:01 pm

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

Postby michelle » Sat Oct 06, 2018 12:37 am

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


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