My answer was 29.6%, why did i get it wrong?   In 1928, 44.8 g of a new element was isolated from 660 kg of the ore molybdenite. The percent by mass of this element in the ore was:   a. 6.6 %   b. 44.8 %   c. 0.0068 %   d. 67 %   e. 29.6 %

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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.