Question

You have a sample of a metal, the sample is exactly 6.02 X 1023atom, if the sample has a mass 55.85 what metal is your sample made of?

Answer 1

9.02 * 10^23 atoms is contained in the Molar Mass of the element so we check with the Periodic Table.

The metal whose Molar Mass is 55.85 is Iron (Answer).

Answer 2

Having 6.02x10^23 atoms means there is 1 mole of atoms.
molar mass of a substance = mass / no. of moles
= 55.85/1
= 55.85 g/mol
Thus, we know that the relative atomic mass of the atoms is 55.85, which indicates that the metal is iron.