Given that the abundant of isotope \( { }^{54} \mathrm{Fe},{ }^{56} \mathrm{Fe} \) and \( { }^{5...

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Given that the abundant of isotope \( { }^{54} \mathrm{Fe},{ }^{56} \mathrm{Fe} \) and \( { }^{57} \mathrm{Fe} \) are \( 5 \%, 90 \% \) and \( 5 \% \) respectively, the atomic mass of \( \mathrm{Fe} \) is :
(A) \( 55.85 \)
(B) \( 55.95 \)
(C) \( 55.75 \)
(D) \( 56.05 \)
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