In chemistry is very common to use the units grams/mol for the atomic weight, so the mass of one atom (of Tin, for example) is calculated as :
massOfOneAtom = (0.11871 (Kg/mol))/(AvogadroConstant (1/mol))= 1.97123*10^-25 Kg
When I try to do that with Mathematica, the Output is:
ma = ElementData["Tin", "AtomicWeight"] Na = Quantity["AvogadroConstant"] massOfOneAtom = ma/Na 118.710u 1 Avogadro constant 118.710 u/Avogadro constant
How can I express this calculation to have a numeric result of the mass of one atom in standard SI units?