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Given that the abundances of isotopes `.^(54)Fe, .^(56)Fe and .^(57)Fe` are 5%, 90% and 5% respectively, the atomic mass of Fe isA. 55.85B. 55.95C. 55.75D. 56.05 |
Answer» Correct Answer - B `.^(54)Fe rarr 5%` `.^(56)Fe rarr 90%` `.^(57)Fe rarr 5%` Av. Atomic mass `= x_(1) A_(1) + x_(2) A_(2) + x_(3) A_(3)` `= 54 xx 0.05 + 56 xx 0.9 + 57 xx 0.05 = 55.95` |
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