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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

queen_honey_blossom answered 2 years ago
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