A guide to interprete mass spectra

5bd65cdb-69ff-4715-aa52-ea0bb87f58db-originalSo according to this table you can deduce a mass of 15 u.a is a fragment CH3:

M(C)=12 g/mol

M(H)=1 g/mol

and CH3 is 12 + 3 x 1 = 15

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