Question

The average atomic mass of a sample of an element A is 31.1 u.
What are the percentages of isotopes A31 and A32 in the sample?

Please answer.... I'll mark u as the branliest
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Answer 1

Explanation:

Let the percentage of

8

16

X be A %. Then the percentage of

8

18

X be (100−A) %.

∴ 16×

100

A

+18×

100

100−A

=16.2

⟹1800−2A=1620

⟹A=90

So the answer is 90%

8

16

X and 10%

8

18

X