Using scanning tunneling microscopy, scientists at IBM wrote the initials of their company with 35 individual xenon atoms. Calculate the total mass of these letters in grams (mXe=131.29 amu).   I saw how it showed us how to solve this problem, however if one were to normally read this problem on a test, how would i be able to tell or know that I need to use Avagadro's number and this certain formula? It does not mention moles anywhere, does it have something to do with the amu? Thank you.

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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.