PLEASE SOMEONE HELP!! Someone must know how to do this problem! I have posted it

Question

PLEASE SOMEONE HELP!! Someone must know how to do this problem! I have posted it several times but no one will answer it! THANK YOU!!

Answer the following GC-MS question and show all math that is necessary.

A) What is the expected relative intensity of M+1 peak if the molecular ion for the following compound has a peak intensity of 54.2

Answer the following GC-MS Questions. Show all math for each problem that requires it! What is the expected relative intensity of M+1 peak if the molecular ion for the following compound has a peak intensity of 54.2 What is the expected relative intensity of M+1 peak if the molecular ion for the following compound has a peak intensity of 54.2

Explanation / Answer

The M+1 peak is caused by the presence of the 13C isotope in the molecule. 13C is a stable isotope of carbon.

The natural abundance of 13C isotope is 1.11% of all carbon atoms.

So if a molecule has one carbon like CH4 then it will have a molecular ion peak and one M+1 ion peak

The peaks will be molecular ion [13CH4]+ as well as [12CH4]+. however the peak due to 13CH4 will be much smaller then the other.

Now the given compound contain 12 Carbons

so abundance of 13C will be 12X1.11% = 13.32% and

12C will be = 86.68%

So if intensity of Molecular ion peak is 54.2 then the intensity of M+1 peak will be

13.32 X 54.2 / 86.68 = 8.32

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