JEE Advanced 2009 Chemistry question

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

Answer: (B)

Solution

Average atomic mass = Σ (fractional abundance × isotopic mass) = 0.05

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Question ID VK-037671