1.

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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