Element XYZ has two isotopes: XYZ-79 (mass =69.9943 amu)  and XYZ-81 (mass=80.9893 amu). If the relative percent abundancy of XYZ-79 is 50.6865% while XYZ-81 is 49.3135%, calculate for the average molar mass of XYZ. Express your answer in 3 significant figures.

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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.