How would you get the atomic mass for scandium?

Answer 1

The conversion factor you need for this problem is Avogadro's number.

(6.02 x 1023 atoms scandium/1 mole scandium) = 1

... OR ...

(1 mole scandium/6.02 x 1023 atoms scandium) = 1

Since you want to end up in units of moles of Sc, this goes in the numerator (on top). You want to convert from atoms Sc, so this goes in the denominator (on the bottom).

atoms Sc1 mole Sc = moles Sc6.02E+23 atoms Sc

Answer 2

You add together the number of neutrons and protons in a scandium atoms. For a more precise measure, you average these numbers across the various isotopes of scandium, weighted in proportion to their abundance. To get an even more accurate answer you would need to make an adjustment for the amount of matter which is converted into the binding energy which holds these nucleons together.

Answer 3

The reciprocal of Avogadro's Number. This is usually expressed as dividing the number of atoms by Avogadro's Number.