Given that the abundance of isotopes is 5%, 90% and 5% respectively, the atomic mass of Fe is: | Mole Concept and Some Basic Concepts of Chemistry — Chem-Mantra

Question

Given that the abundance of isotopes $^{54}Fe, ^{56}Fe, ^{57}Fe$ is 5%, 90% and 5% respectively, the atomic mass of Fe is:

Answer: B

💡 Solution & Explanation

$\text{Avg. mass} = (54 \times 0.05) + (56 \times 0.90) + (57 \times 0.05) = 2.7 + 50.4 + 2.85 = 55.95$. [2]

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