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Janette 3B
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Joined: Fri Jul 15, 2016 3:00 am


Postby Janette 3B » Mon Sep 26, 2016 4:38 pm

When determining the molecular formula, (after figuring out the empirical formula) how do you know what number to multiply the empirical formula?

For example, C3H4C3(empirical formula) with a mass spectrometry of 176.14g and the molar mass was 88.06 g mol, the empirical formula was multiple by 2 in order to obtain the molecular formula was C6H8O6?

How does one know what number to multiply the empirical formula by? Is it always going to be multiplied by 2?

Posts: 11
Joined: Wed Sep 21, 2016 2:56 pm


Postby Scott_Anderson_3J » Mon Sep 26, 2016 4:58 pm

The mass of the molecule is 176.14g and the molar mass of the empirical formula is 88.06g. You multiply by 2 because 176.14 / 88.06 is equal to 2. It won't be multiplied by 2 in every conversion, but you can follow the same process to find what to multiply by if you are given the same information.

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