Alex’s mass before getting the tattoo was 61.5 kg.  The tattoo contains 5.20x1023 molecules of iron (II, III) oxide.  What is Alex’s mass (in kg) after getting the tattoo?

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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.