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JEE Advanced2009ChemistryStructure of AtomActual

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

Options

  1. A55.85
  2. B55.95
  3. C55.75
  4. D56.05

Correct answer

B. 55.95

Step-by-step solution

Average atomic weight 54 5+56 90+57 5 100 =55.95

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