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Gas Chromatography – Mass SpectroscopyEssay Preview: Gas Chromatography – Mass SpectroscopyReport this essayPurpose:The Purpose of this experiment is to determine the quantity of caffeine in a sample using an instrument called Gas Chromatography-Mass Spectroscopy (GC-MS). The caffeine samples that are evaluated are coffee, espresso and a deuterated caffeine sample (d3), given by the T.A., of.