The mass spectrum of an organic compound shows the relative abundances of M to be 53.76%...
The mass spectrum of an organic compound shows the relative abundances of M to be 53.76% and M 1 to be 3.489%. Assuming the peaks are caused by 12C and 13C isotopes, determine the number of carbon atoms in the compound. Natural abundances: 12C is 98.93% and 13C is 1.07%
Homework Answers
Solution:
According to relative abundance and natural abundance equation,
AM+1 / AM = nc x ( abundance 13C / abundance 12C)
Where, AM+1= Relative percent abundance of M+1 peak
AM = Relative percentage abundance of M peak
Therefore,
AM1 / AM = nc x (1.07/98.93)
3.489 / 53.76 = nc x 1.07 / 98.93
6.4205 = nc x 1.07
nc = 6.4205 / 1.07 = 6.00
Hence, number of carbons = 6
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SPECTRUMS THAT NEED TO BE ANALYZED TO PREDICT
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