On earth, tin has 10 different stable isotopes. The heaviest, 124 Sn makes up 5.80% of naturally occurring tin atoms. a) How many atoms of 124 Sn are present in 21.9 g of a natural sample of tin? 124 Sn: atoms Helpful tip: To enter a number in scientific notation, enter 1.0E5 or 1.0e5, for 1.0 x 105 where the E# (or e#) denotes 10# b) Considering 124 Sn has an isotopic mass of 123.905 amu, calculate the mass of this isotope in the sample. Mass: g

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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.