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Q.

The average atomic mass of the element X with is 220.4


isotope: abundance: mass:


221x : 74.22 : 220.9


220x : 12.78 : 220.0


218x : 13.00 : 218.1


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is true.
 

Isotope

% abundance

Ar

Contribution

221x

74.22

220.9

163.95

220x

12.78

220.0

28.12

218x

13.00

218.1

28.35

Atomic mass = 220.4
The average relative atomic mass of element X is 220.4.
 
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