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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

`11.25`

B

`20`

C

`16`

D

`10`

Text Solution

Verified by Experts

Thus the ratio is `16: 3: 1`
Total `= 16+3+1 = 20`
Average weight `= (11 xx 16 + 12 xx 3 + 13 xx 1)/(20) = 11.25`
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