Question
In: Chemistry
The mass spectrum of an organic compound shows the relative abundances of M to be 38.68%...
The mass spectrum of an organic compound shows the relative abundances of M to be 38.68% and M 1 to be 7.112%. 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%
Solutions
Expert Solution
percentage relative abundance of M+1 to M
= (M+1) % / M
= (7.112 / 38.68) x 100
= 18.38 %
number of carbon atoms = ((M+1) % / M ) / natural abundance of 13C
= 18.38 / 1.07
= 17.18
number of carbon atoms = 17
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