Final answer:
Gas chromatography-mass spectrometry identifies substances based on the mass of their molecules.
Explanation:
Gas chromatography-mass spectrometry (GC-MS) identifies a substance based on the mass of its molecules. In GC-MS, each separated compound is sent directly from the end of the GC column into the MS instrument, providing a separate mass spectrum for each compound present in the original mixed sample. The mass spectrometer separates ions by their mass-to-charge ratio to generate a mass spectrum containing quantitative and qualitative information about the analyte.
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