In mass spectrometry of an organic compound, the peak with the highest m/z value that comes from the intact molecule is called the molecular ion peak. What does its m/z value indicate?
Answer and explanation
Correct answer: C. The relative molecular mass of the compound, if the ion has a charge of +1
- Step 1: A molecule loses one electron to give M+, which is still the whole molecule.
- Step 2: With a charge of +1, m/z equals the relative molecular mass.
Answer
the relative molecular mass.
Why not the others: Carbon count and functional groups need more information; fragment percentages are shown by relative peak heights.
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