Mass-to-Charge Ratio

In mass spectroscopy, the mass-to-charge ratio (symbols: m/z, m/e) of a cation is equal to the mass of the cation divided by its charge.



Since the charge of cation formed in the mass spectrometer is almost always +1, the mass-to-charge ratio of a cation is usually equal to the mass of the cation.



The mass of the molecular ion is equal to the molecular weight of the compound.  Thus, the mass-to-charge ratio of the molecular ion is equal to the molecular weight of the compound.

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