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# mass spec question watch

1. I dont know how to do question 3, could anyone explain how to do this please?
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2. There are eight possible combinations:

79 79 35
79 79 37
79 81 35
79 81 37
81 79 35
81 79 37
81 81 35
81 81 37

Work out the chances of each one and compile into a spectrum.
3. (Original post by Pigster)
There are eight possible combinations:

79 79 35
79 79 37
79 81 35
79 81 37
81 79 35
81 79 37
81 81 35
81 81 37

Work out the chances of each one and compile into a spectrum.
There are only 6 possible molecules.

81 79 is the same as 79 81, as in its the same combination but with double the probability (as I'm sure you know)
4. They could be structural isomers.
5. (Original post by Pigster)
There are eight possible combinations:

79 79 35
79 79 37
79 81 35
79 81 37
81 79 35
81 79 37
81 81 35
81 81 37

Work out the chances of each one and compile into a spectrum.
so the height is the probability? but what am i actually plotting on the bottom?
6. (Original post by jacksonmeg)
so the height is the probability? but what am i actually plotting on the bottom?
m/z
7. Yes and m/z or m/e whichever is preferred, I'd go with some random (large-ish) number, n, and go up to n+5.

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