Iron is found in Earth’s crust as several different iron com-pounds. Calculate the mass (in kg) of each compound that contains 1.0  103kg of iron.(a) Fe2O3 (hematite)(b) Fe3O4 (magnetite)(c) FeCO3 (siderite)

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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.