How many moles of iron are in 1.2*10^25 atoms of iron?

1 Answer
Sep 13, 2016

Approx. 20 moles of iron.

Explanation:

There are approx. 6.022xx10^23 iron atoms per mole of ion. This quantity, this number of iron atoms has a mass of 55.85*g. And of course, when we quote the mass of iron we say 55.85*g*mol^-1.

So,
(1.2xx10^25*"atoms of iron")/(6.022xx10^23*"iron atoms per mole") ~= 20*"moles"