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    Chemguide - Answers: Mass Spectra: The M+ Line

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    Khondokar Tarakky
    The document discusses mass spectrometry and identifying compounds from their mass spectra. It addresses several examples: 1) Identifying ethanoic acid as the only compound that matches a given total mass of 46. 2) Several possible structures are given for an unknown compound with the molecular formula C2H6O. 3) Fragments seen in the mass spectrum of methanoic acid and how they can be represented.

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    Chemguide - Answers: Mass Spectra: The M+ Line

    Uploaded by

    Khondokar Tarakky
    17 views1 page
    The document discusses mass spectrometry and identifying compounds from their mass spectra. It addresses several examples: 1) Identifying ethanoic acid as the only compound that matches a given total mass of 46. 2) Several possible structures are given for an unknown compound with the molecular formula C2H6O. 3) Fragments seen in the mass spectrum of methanoic acid and how they can be represented.

    Original Description:

    Mass Spectroscopy Q A

    Original Title

    a-msmplus

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    The document discusses mass spectrometry and identifying compounds from their mass spectra. It addresses several examples: 1) Identifying ethanoic acid as the only compound that matches a given total mass of 46. 2) Several possible structures are given for an unknown compound with the molecular formula C2H6O. 3) Fragments seen in the mass spectrum of methanoic acid and how they can be represented.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    17 views1 page

    Chemguide - Answers: Mass Spectra: The M+ Line

    Uploaded by

    Khondokar Tarakky
    The document discusses mass spectrometry and identifying compounds from their mass spectra. It addresses several examples: 1) Identifying ethanoic acid as the only compound that matches a given total mass of 46. 2) Several possible structures are given for an unknown compound with the molecular formula C2H6O. 3) Fragments seen in the mass spectrum of methanoic acid and how they can be represented.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
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    Chemguide answers

    MASS SPECTRA: THE M+ LINE


    1. a) 46. You have to assume that the heaviest line corresponds to the molecular ion. An examiner
    couldn't ask the question otherwise.
    b) I found:

    H H

    C2H6O which could be either

    or

    H H

    O
    CO2H2

    H C C O H

    H C O C H
    H

    H C
    O H

    C2H3F

    H
    C

    H
    CH6N2

    H H H
    N C N
    H H H

    c) You just have to do this by trial and error. By adding up the accurate masses, you will find that
    the only compound which gives this total mass is HCOOH, methanoic acid
    d)

    HCOOH

    [HCOOH]+ + e-

    You can write a dot (to show that it is now a radical) as well as the + sign after the molecular ion if
    you want to. Make sure that you are consistent with whatever your examiners use. If in doubt,
    include the dot.
    e)

    17: [OH]+ (In this, and all the other cases, if you don't show the plus sign, it is wrong!)
    28: [CO]+
    29: [HCO]+
    45: either [HCOO]+ or [COOH]+

    www.chemguide.co.uk

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