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Given that the abundacne of isotopes .^(...

Given that the abundacne of isotopes `.^(54)Fe`, `.^(56)Fe`, and `.^(57)Fe` is 5%, 90% and 5% respectively. The atomic mass of `Fe` is

A

`55.85`

B

`55.95`

C

`55.75`

D

`56.05`

Text Solution

Verified by Experts

The correct Answer is:
B
At. Mass of `Fe = (54 xx 5 + 56 xx 90 + 57 xx 5)/(100)`
`= (270 + 5040 + 285)/(100) = (5595)/(100) =55.95`
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