Exercise: calculate the average atomic mass for the naturally occurring Mg element. The isotope distribution is shown in the following table. a. 24.33 Hint: Average atomic mass = Σ(Natural abundunce x isotopic mass) b. 24.31 Isotope Natural Abundance (%) Isotopic mass 78.99 23.99 Mg 10.00 24.99 11.01 25.98 c. 24.30 d. 24.32 e. 24.29 Mg Mg

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Q: Question attached

A: Ans: Rb-85 = 72.17% = 0.7217 * 84.91 amu = 61.2795 Rb-87 = 27.83% = 0.2783 * 86.91 amu = 24.1871

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Mass Spectrometry

This process is an instrumental method in which a sample is changed to fast moving positive ions by electron bombardment. The charged particles vary due to their different mass to charge ratio and are estimated with the help of this difference. It is also called mass spectroscopy.