Q.

An element X has the following isotopic composition.X  100:80%,102X:20%The weighted average atomic mass of the naturally occurring element X is closest to

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a

101.1 amu

b

100.4 amu

c

100.8 amu

d

101.8 amu

answer is B.

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Detailed Solution

Mavg =100×80+102×20100=100.4 amu
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An element X has the following isotopic composition.X  100:80%,102X:20%The weighted average atomic mass of the naturally occurring element X is closest to