Mole ConceptHard

Question

Given that the abundances of isotopes 54Fe, 56Fe and 57Fe are 5%, 90% and 5% respectively, the atomic mass of Fe is

Options

A.55.85
B.55.95
C.55.75
D.56.05

Solution


= 54 × 0.05 + 56 × 0.90 + 57 × 0.05 (where is atomic mass of Fe)
= 55.95

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