Question

e) i) Iron exists as a mixture of four isotopes, state the similarities and differences between these isotopes: 54Fe, 56Fe,57Fe, 58Fe.

ii) Use the data below to calculate the relative atomic mass of iron, give your answer to 3 significant figures.


Isotope Abundance
(%)
54Fe 5.8
56Fe 91.7
57Fe 2.2
58Fe 0.3

Answer 1

1. $Mmixture=\Sigma Iambudance *Misotope$
2. {M_mixt}=0.058*54+0.917*56+0.022*57+0.003*58=55.912
3. [M]=g/mole
4. Mmixture=55.912 g/moles