If you have 6.02 x 10^23 atoms of metallic iron, you will have how many grams of iron

Avagadros number states that 1 mol of any substance consists of 6.022 x 10^23 units.

These units could be molecules making up a compound or atoms making up an element.

Therefore 1 mol of Fe consists of 6.022 x 10^23 molecules of Fe

The weight of 1 mol is molar mass. Molar mass of Fe is 55.8 g/mol

6.022 x 10^23 molecules of Fe weighs 55.8 g/mol

Therefore 6.02 x 10^23 molecules weigh - 55.8 / (6.022x10^23) x 6.02 x 10^23 molecules

Mass of Fe - 55.8 g