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Tentukan kelimpahan isotop 63Cu dan 65Cu jika diketahui Ar Cu = 63,5!

Tentukan kelimpahan isotop 63Cu dan 65Cu jika diketahui Ar Cu = 63,5!

Jawaban:

misal kelimpahan isotop 63 = X

misal kelimpahan isotop 65 = 100-X

menentukan Ar dari Cu :

begin mathsize 14px style Ar space Cu space equals left parenthesis percent sign cross times isotop space 63 right parenthesis space plus left parenthesis percent sign cross times isotop space 65 right parenthesis 63 comma 5 space equals space left parenthesis X over 100 cross times 63 right parenthesis plus left parenthesis fraction numerator 100 minus sign X over denominator 100 end fraction cross times 65 right parenthesis 63 comma 5 equals space left parenthesis fraction numerator 63 X over denominator 100 end fraction right parenthesis plus left parenthesis fraction numerator 6500 minus sign 65 X over denominator 100 end fraction right parenthesis 63 comma 5 equals space fraction numerator left parenthesis 63 X right parenthesis plus left parenthesis space 6500 minus sign 65 X right parenthesis over denominator 100 end fraction 6350 equals space minus sign 2 X space plus space 6500 2 X space space space equals space 6500 minus sign 6350 x space space space space space equals space 75 end style 

Jadi, kelimpahan isotop 63 = X=75% dan kelimpahan isotop 65 =100-X=25%

 

 

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