why does TCDD C12H4O2Cl4 give 5 molecular ion peaks?

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sefth3
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I'm trying to work this out but its too much for my brain hah... it's to do with the 2 isotopes of chlorine i know that but not sure on the rest!

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Tammie2345524
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There are 4 chlorine molecules, and 2 isotopes of chlorine (chlorine 35 and chlorine 37), so the 5 molecular peaks come from different combinations of chlorine atoms:
A molecule with 4 chlorine-35 atoms has mr 320
3 chlorine-35 atoms and 1 chlorine-37 atom give an mr of 322
2 chlorine-35 atoms and 2 chlorine-37 atoms give an mr of 324
1 chlorine-35 atom and 3 chlorine-37 atoms give an mr of 326
4 chlorine-37 atoms give an mr of 328.
There are 5 possible molecular masses depending on the combination of chlorine atoms, so the mass spectrum has 5 molecular peaks.
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Ralfinho
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(Original post by Tammie2345524)
There are 4 chlorine molecules, and 2 isotopes of chlorine (chlorine 35 and chlorine 37), so the 5 molecular peaks come from different combinations of chlorine atoms:
A molecule with 4 chlorine-35 atoms has mr 320
3 chlorine-35 atoms and 1 chlorine-37 atom give an mr of 322
2 chlorine-35 atoms and 2 chlorine-37 atoms give an mr of 324
1 chlorine-35 atom and 3 chlorine-37 atoms give an mr of 326
4 chlorine-37 atoms give an mr of 328.
There are 5 possible molecular masses depending on the combination of chlorine atoms, so the mass spectrum has 5 molecular peaks.
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