Reading mass spec

[Hemichordate]

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For mass spec, if you want to know what compound it is by looking at the spectra, could you just simply look at the largest mass/charge (m/z) value and add one and that would be the molecular weight of the compound? Does that work for every compound?

 

[Hemichordate]

.

 

[Isoprop]

almost always, and for the MCAT, probably always.