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What is the percent composition of all the elements in vitamin B12?
What is the percent composition of all the elements in vitamin B12 (C63H88CoN14O14P)?
Report answer to the proper number of significant figures.
Chemistry teacher didn’t explain this very well and I don’t really get it. Help would be appreciated thank you!
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#2 written by Daniela C 2 years ago
Find the molar mass of the whole molecule (I’d do it for you but it’s pretty big
) Then, divide the individual molar mass of each element (which is the mass of the element x number of atoms in the molecule. Ex- C 12×63=756) by the molar mass of the entire molecule= 0.whatever. In order to get % multiply by 100. - Comment Feed for this Post
Molar mass of cyanocobalamin B12 is 1355
So % compositions
C = 756/1355 x100 = 55.8%
H = 88/1355 x100 = 6.5 %
Co = 59/1355 x100 = 4.4 %
N = 14.5 %
O = 16.53 %
P = 2.3 %
The Molar mass is taken from wiki