题目内容

Among the following methods, which can determine the molecular mass?

A. Ultraviolet spectrum
B. Infrared spectrum
C. Luminescence Spectrometry
D. Mass spectrometry

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For compounds composed of C, H, O, and N, the mass numbers of the molecular ion peaks of the mass spectrum are even numbers.

The peak with the largest mass-to-charge ratio in the mass spectrum must be the molecular ion peak.

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