Question

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

Answer 1

Answer:

33 and 66 percent

A+2 is 33

and

A-1 is 66

Answer 2

Answer:

The answer is 66.67%.

Explanation:

Let the percentage of A-1 in the element is X

Then X×(A-1 )+ (100-X)(A+2)= 100A

AX- X + 100A+ 200- AX- 2X= 100A

3X=200

X=66.67%

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