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Given that the abundances of isotopes ""...

Given that the abundances of isotopes `""^54 Fe, ""^56Fe` and `""^57Fe` are 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
Atomic mass of Fe
` = (5 xx 54 +90 xx 56 + 5 xx 57)/(100)`
` = (270 + 5040 + 285)/(100)`
= 55.95
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Knowledge Check

  • Given that the abundance of isotopes "^54Fe , "^56Fe and "^57Fe are 5%, 90% and 5% respectively, the atomic mass of Fe is

    A
    55.85
    B
    55.95
    C
    55.75
    D
    56.05

  • High cosmic abundance of Fe is due to

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    its higher nuclear binding energy
    B
    its ferromagnetic nature
    C
    its less reactivity
    D
    `4s^23d^6` configuration

  • Oxygen contains 90% "^16O . Its atomic mass is

    A
    16.2
    B
    17.4
    C
    17
    D
    16.5

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