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

1 Answer
anor277
Dec 21, 2016

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......

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