Chemistry - Mass Spec question help AQA

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username1441610
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Can anyone explain question 11 iv please?
(http://pmt.physicsandmathstutor.com/...0Structure.pdf)
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telepathicnine
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(Original post by J-ved)
Can anyone explain question 11 iv please?
(http://pmt.physicsandmathstutor.com/...0Structure.pdf)

The m/z ratio of the 36S+ ion is 36

So one of those Ge isotopes has an ion that can give that same m/z (the question says "indistinguishable", so basically the same peak as the S ion)

It's likely that the Ge ion will have a 2+ charge. To get from 70-74 to 36, you can't just have a 1+ charged ion.

So playing w/ some numbers, you find that if the 72Ge isotope had a 72Ge2+ ion, it would also have m/z = 36
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username1441610
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(Original post by telepathicnine)
The m/z ratio of the 36S+ ion is 36

So one of those Ge isotopes has an ion that can give that same m/z (the question says "indistinguishable", so basically the same peak as the S ion)

It's likely that the Ge ion will have a 2+ charge. To get from 70-74 to 36, you can't just have a 1+ charged ion.

So playing w/ some numbers, you find that if the 72Ge isotope had a 72Ge2+ ion, it would also have m/z = 36
I see, thank you!
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