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NEED HELP ASAP no ROCKY watch

1. Calculate the ratio of signal intensities for the ion [M 1] with respect to [M] for the molecule C12H24. Express the results in %?How would one go about answering this question? I have been stuck on it for so long. Could you also please explain it?
2. Calculate the ratio of signal intensities for the ion [M+1]+ with respect to [M]+ for the molecule C12H24. Express the results in %.

3. (Original post by anorak.potato)
Calculate the ratio of signal intensities for the ion [M+1]+ with respect to [M]+ for the molecule C12H24. Express the results in %.

You have to work out the relative probability of the isotopes of hydrogen and carbon in the molecular ion.

The relative mass is 168 with no isotopes

The probability of 13C is about 1 in 100 (say), so with 12 carbon atoms you have a 12 in 100 chance of m/z = 169
(the probabilities are invented)

Do the same for hydrogen/deuterium and find the total probability of one molecule having an m/z = 169

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Updated: February 8, 2018
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