Q.

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

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a

55.85

b

55.95

c

55.75

d

56.05

answer is B.

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Detailed Solution

Average atomic weight =54×5+56×90+57×5100=55.95
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Given that, the abundances of isotopes Fe  54,Fe  56 and Fe  57 are 5%, 90% and 5% respectively, the atomic mass of Fe is