1.

An element X has the following isotopic composition: `.^(200)X:90% .^(199)X:8.0% .^(202)X:2.0%` The weight average atomic mass of the naturally occurring element X is closest toA. 201uB. 202 uC. 199 uD. 200 u

Answer» Correct Answer - D
Weight of `^.(200)X=0.90xx200=180.00u`
Weight of `.^(199)X=0.08xx199=15.92u`
Weight of `.^(202)X=0.02xx202=4.04u`
Total weight `=199.96~~200u`


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