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The mass number of three isotopes of an...

The mass number of three isotopes of an element are `11,12 and 13` .Their percentage ohandances `80,15 and 5`, respectively .What is the atomic weight of the element ?

A

`10.25`

B

`11.25`

C

`12.25`

D

`13.25`

Text Solution

Verified by Experts

The correct Answer is:
B
Avg.at.wt `=(sum % "abundance" xx "Atomic weight")/("Totalratio")`
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