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A mass spectrum (MS) of salicylic acid would show a peak at m/z 138, which corresponds to the molecular ion [M]+. There would also be peaks at m/z 120, 108, 92, 77, and 65, which correspond to the fragments [M-H2O]+, [M-CH3OH]+, [M-CO2]+, [M-COOH]+, and [M-CH2COOH]+, respectively.