Discussion
What is exact mass used for?
Answer: D
Because each element's exact mass differs slightly from an integer, carbon monoxide at 27.9949 and nitrogen at 28.0062 are distinguishable given enough resolution, though both are nominally twenty-eight. Isotope abundance, charge state and calibration are separate matters. Turning a mass measurement into a formula assignment is what high resolution buys, and it is often more decisive than any amount of fragmentation data. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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