The “nitrogen rule” of mass spectrometry requires a compound containing an odd number of nitrogens to have an odd-mass molecular ion and a c

Question

The “nitrogen rule” of mass spectrometry requires a compound containing an odd number of nitrogens to have an odd-mass molecular ion and a compound containing an even number of nitrogens to have an even-mass molecular ion. What is the molecular formula of the CHN-containing compound pyrazine, M+ = 80? (The order of atoms should be carbon, then hydrogen, then others in alphabetical order.)

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Thu Nguyệt 4 years 2021-07-16T18:19:30+00:00 1 Answers 42 views 0

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  1. RobertKer
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    2021-07-16T18:21:10+00:00
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    Answer:

    C₄H₄N₂

    Explanation:

    Given that:

    M+ = 80.

    It implies that the number of nitrogen present in the molecule must also be even according to the Nitrogen rule.

    So from the Formula CHN, the nitrogen will have to be 2 because if we make use of 4, it will exceed the given M+ which is 80.

    ∴

    C₄ = 4 × 12 = 48

    H₄  = 4 × 1   = 4

    N₂ =  2 × 14 = 28      

                          80      

    As such, the molecular formula of the compound is C₄H₄N₂

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