Question

An element has 2 isotopes.The mass of one isotope is A-1 and the other is A-2.If the average is A.Find the percentage of isotope A-1 in the element​

Answer 1

Answer:

Explanation:

Correct option is

A

A+  

9

10

​

 

The average atomic mass of the element

=  

3+2+4

[3×A]+[2×(A+1)]+[4×(A+2)]

​

 

=  

9

[3A]+[2A+2]+[4A+8]

​

 

=  

9

9A+10

​

 

=A+  

9

10

​