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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)