Midterm

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Dustin Shin 2I
Posts: 64
Joined: Fri Sep 28, 2018 12:26 am

Midterm

Postby Dustin Shin 2I » Sun Nov 11, 2018 10:18 pm

I had no idea how to solve what I believe was the second question on the midterm. It asked about gallic acid and we had to find the empirical formula which I wasn't able to do. How would you solve this question? Sorry for being extremely vague.

Luis_Yepez_1F
Posts: 50
Joined: Fri Sep 28, 2018 12:18 am

Re: Midterm

Postby Luis_Yepez_1F » Sun Nov 11, 2018 10:54 pm

You would take the percentage of molar mass of each element so in CO2 you would divide 12.011/(12.011+2*15.999), then multiply by how many grams of the molecule you have, you would do this again for the hydrogen in H2O, once you have these two weights of the elements you are looking for, you would add them together then subtract it from 1g to get the weight for oxygen since its in both products. From here you would use this to find the empirical formula.


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