An ore contains 18.8% of the mineral molybdenite, mos2, which is a source of the element mo. how much ore must be processed in order to obtain 12.0kg of mo?

63.8kg is the answer.
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If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom