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Some key considerations, usually omitted, for a full understanding of the concept of Amount of substance) The understanding and correct use of the magnitude Amount of substance and its unit, the mole, presents serious difficulties, not only for students but even for teachers. Abundant research has shown the frequency of some erroneous conceptions shown by teachers and textbooks, which interpret quantity of substance either as number of particles or, more frequently as mass... or even ignore thedoi:10.1016/s0187-893x(18)30084-3 fatcat:72ovghdelvdkvavddrwjyf4pcu