Empirical and Molecular Formula Masses

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Clara Cho 2K
Posts: 103
Joined: Wed Sep 18, 2019 12:18 am

Empirical and Molecular Formula Masses

Postby Clara Cho 2K » Wed Oct 02, 2019 12:06 pm

If the molecular mass of the empirical formula of a molecule is larger than the given mass of the molecular formula, is the empirical formula incorrect?

Nicholas Chin 1G
Posts: 100
Joined: Thu Jul 11, 2019 12:17 am

Re: Empirical and Molecular Formula Masses

Postby Nicholas Chin 1G » Wed Oct 02, 2019 12:08 pm

If the given mass of the molecular formula is the g/mol, yes the empirical formula is wrong.

Brandon Valafar
Posts: 112
Joined: Sat Aug 17, 2019 12:16 am
Been upvoted: 1 time

Re: Empirical and Molecular Formula Masses

Postby Brandon Valafar » Wed Oct 02, 2019 12:22 pm

Yes. The Empirical Formula mass can be equal to or less than the Molecular Formula mass, but not greater than.

Hannah Romano 4D
Posts: 55
Joined: Sat Aug 24, 2019 12:18 am

Re: Empirical and Molecular Formula Masses

Postby Hannah Romano 4D » Wed Oct 02, 2019 12:50 pm

The mass of the molecular formula can ONLY be greater than or equal to the mass of the empirical formula, never less than it. This is because the empirical formula is the smallest possible ratio of the molecule in question. The molecular formula is any whole number multiple of this empirical ratio including a multiple of 1. Because of this, the molecular formula can only have a greater than or equal to mass to the empirical formula.

605110118
Posts: 75
Joined: Wed Sep 18, 2019 12:21 am

Re: Empirical and Molecular Formula Masses

Postby 605110118 » Wed Oct 02, 2019 10:44 pm

In terms of finding the Empirical formula, you wouldn't need molar mass to solve that problem right?

MaggieHan1L
Posts: 100
Joined: Thu Jul 11, 2019 12:17 am

Re: Empirical and Molecular Formula Masses

Postby MaggieHan1L » Wed Oct 02, 2019 10:46 pm

Empirical formula is the lowest ratio so molecular formula should not be greater than the empirical.


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