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Carbon found in nature as a mixture of C...

Carbon found in nature as a mixture of C-12 and C-13. The average atomic mass of carbon is 12.011u. What is the percentage abundance of carbon-12 in nature?

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Let 'x' be the percentage abundance of Carbon - 12, then `(100 -x)` will be the percentage abundance of Carbon-13.
Therefore, `(12x)/(100)+(13(100-x))/(100)=12.011`
`rArr 12x+1300-13x=1201.1 rArr x=98.9`
Abundance of Carbon - 12 is `98.9%`.
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