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### F. 9

Posted: **Tue Oct 03, 2017 11:23 pm**

by **Juanalv326**

Vanillin is found in vanilla extracted from Mexican orchids. A report on the analysis of vanillin listed the mass percentage composition as 63.15% C, 5.30% H, and 31.55% O. In what atom ratios are the atoms present in vanillin?.

### Re: F. 9

Posted: **Tue Oct 03, 2017 11:54 pm**

by **Aya Shokair- Dis 2H**

This question is asking you to determine the empirical formula which, by definition, is the ratio between the atoms in the molecule. So, by assuming that you're working with 100 g of Vanillin, you can convert each mass by composition percent to grams. For example, 63.15% C could be expressed as 63.15 g C, which you'd convert to moles. You do this to all of them, divide each by the smallest number of moles, and multiply all by a number to reach that smallest whole number ratio between the atoms in your molecule, if required! Hope that helps!

### Re: F. 9

Posted: **Thu Oct 05, 2017 4:48 pm**

by **Isabella Zizolfi 2F**

Firs you have to find the empirical formula (which is C8H8O3) then you have to calculate the atom ratio (which is, in this case, 8:8:3)