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13 December, 18:11

Devise a general method for determining the fractional abundances of two or more isotopes from a mass spectrum. Your method must include some means of measuring the signals. You must state the the of of measuring decide that you will need to apply your method.

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  1. 13 December, 18:25
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    In this case, we can simply use a ruler to measure the heights of the signal. Use the same ruler all throughout to reduce deviations in the measurement.

    So for example we have 3 isotopes, so we get 3 signals with heights of (for example):

    isotope 1 = 62

    isotope 2 = 2

    isotope 3 = 8

    Therefore the mass of the signals would be:

    62 + 2 + 8 = 72

    The fractional abundance of each isotope would be:

    frac isotope 1 = 62/72 = 0.86

    frac isotope 2 = 2/72 = 0.03

    frac isotope 3 = 8/72 = 0.11
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