Chemistry, asked by ankushraoasb, 1 month ago

An element A has two isotopes. 21A (30%) and 23A (70%). The average atomic mass of the element A is

Answers

Answered by xxsomeoneshizukaxx40

2

Answer:

Let the percentage of 816X be A %. Then the percentage of 818X be (100−A) %.

∴ 16×100A+18×100100−A=16.2

⟹1800−2A=1620

⟹A=90

So the answer is 90% 816X and 10% 818X

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