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MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryMole _ Equivalent ConceptAtomic and Molecular Masses

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

A.55.85

B.55.95✓ Correct

C.55.75

D.56.05

Explanation

We know that, to calculate the average atomic mass of Fe 5 54 90 56 5 57 /100 55.95u x x x Mole Concept MOLE & EQUIVALENT CONCEPT 30

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