F. 9

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F. 9

Postby Juanalv326 » Tue Oct 03, 2017 11:23 pm

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?.

Aya Shokair- Dis 2H
Posts: 58
Joined: Fri Sep 29, 2017 7:07 am

Re: F. 9

Postby Aya Shokair- Dis 2H » Tue Oct 03, 2017 11:54 pm

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!

Isabella Zizolfi 2F
Posts: 21
Joined: Fri Sep 29, 2017 7:05 am

Re: F. 9

Postby Isabella Zizolfi 2F » Thu Oct 05, 2017 4:48 pm

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)

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