Question

How can the mass of an atom from the periodic table be represented in respect to moles?

Answer 1

Well, the atomic mass is always quoted in units of `g*mol^-1`.

Explanation:

The mass quoted on the Periodic Table for iron is `55.85*g*mol^-1`.

That is `"Avogadro's Number"` of iron atoms, i.e. `6.022xx10^23` individual iron atoms, has a mass of `55.85*g`.

When we wish to work out the molar quantity, the molar equivalence of a given mass of iron, say `5.0*g`, we take the quotient:

`"Moles of iron"` `=` `(5.00*cancelg)/(55.85*cancelg*mol^-1)=??*1/(mol^-1)=??mol.`

And thus the quoted molar quantity represents a specific number of inidvidual iron atoms, or, alternatively, formula units......