Answer :
Since a mol is always a constant number = 6.022*10^23, to find how many moles there are in 4.5*10^23 molecules of iron we only need to do a simple math:
6.022*10^23 = 1 mol
4.5*10^23 = x moles
x = 0.7 moles
Since a mol is always a constant number = 6.022*10^23, to find how many moles there are in 4.5*10^23 molecules of iron we only need to do a simple math:
6.022*10^23 = 1 mol
4.5*10^23 = x moles
x = 0.7 moles