An element, X has the following isotopic composition;
200X: 90%
199X : 8.0%
202X ; 2.0 %
The weighted average atomic mass of the naturally -occurring element X is closet to:
200 amu
201 amu
202 amu
199 amu
A.
200 amu
Weight of 200X = 0.90 x 200 = 180.00 amu
Weight of 199X = 8.08 x 199 = 15.92 amu
Weight 0f 202X = 0.02 x 202 = 4.04 amu
Total weight = 199.06 = 200 amu
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