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Given that the abundances of isotopes ""...

Given that the abundances of isotopes `""^(54)Fe,""^(56)Fe`, and `""^(57)Fe` are 5%, 90%, and 50 % respectively. The atomic mass of iron is :

A

55.85

B

55.95

C

55.75

D

55.05

Text Solution

Verified by Experts

The correct Answer is:
B
Average atomic mass `= sum("Relative abundance of the elements" xx "Molar mass of elements")/100`
`= 0.05 xx 54 +0.9 xx 56 + 0.05 xx 57`
`= 55.95`.
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