An element has two isotopes with atomic masses (A−1) and (A+3) respectively. The average atomic mass is A. Calculate the mole percentage of the heavier isotope.
A
35%
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B
45.35%
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C
25%
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D
None of these
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Solution
The correct option is B25% mass of two isotype are (A−1) and (A+3)
Let the % of isotypes which is lighten =x
∴% of isotopes which is heavier =(100−x)
Now
ATQ Average mass of element =A
Average mass of element=n∑i(%Abundance of the isotope)Ai×Ai100