Question

the average atomic mass of sample of element is 20:2u. What are percentages of isotopes 20
D
10
and 22
D
10
in the sample
plz help​

Answer 1

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

Explanation:

I hope it will help u

Answer 2

Explanation:

90% 816X and 10%818X

will be the answer