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Neon terdiri atas dua isotop, yaitu 20Ne dan 22Ne. Jika Ar Ne = 20,20 berapakah kelimpahan masing-masing isotop neon di atas!

Neon terdiri atas dua isotop, yaitu 20Ne dan 22Ne. Jika Ar Ne = 20,20 berapakah kelimpahan masing-masing isotop neon di atas!

Jawaban:

misal kelimpahan 20 Ne =X

misal kelimpahan 22 Ne = 100-X

begin mathsize 14px style Ar space space space space space space equals space left parenthesis percent sign cross times isotop space 20 right parenthesis space plus space left parenthesis percent sign cross times isotop space 22 right parenthesis 20 comma 20 space equals space left parenthesis X over 100 cross times 20 right parenthesis space plus space left parenthesis fraction numerator 100 minus sign X over denominator 100 end fraction space 22 right parenthesis 20 comma 20 space equals space left parenthesis X over 100 cross times 20 right parenthesis space plus space left parenthesis fraction numerator 100 minus sign X over denominator 100 end fraction space 22 right parenthesis 2020 space space equals space left parenthesis fraction numerator 20 X over denominator 100 end fraction right parenthesis plus left parenthesis fraction numerator 2200 minus sign 22 X over denominator 100 end fraction right parenthesis 2020 space space equals 20 X plus 2200 minus sign 22 X 2 X space space space space space equals 2200 minus sign 2020 2 X space space space space space equals 180 X space space space space space space space equals 180 over 2 X space space space space space space space equals 90  end style 

Jadi, kelimpahan isotop 20 = 90 % dan kelimpahan isotop 22 = 100-90=10%. 

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