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  4. If isotopic distribution of C-12 and C-14 is 98% and 2% respectively, then the number of C-14 atoms in 12 g of carbon is

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Q. If isotopic distribution of C-12 and C-14 is 98% and 2% respectively, then the number of C-14 atoms in 12 g of carbon is

Some Basic Concepts of Chemistry

Solution:

In $12\, g$ of carbon, the amount of $C - 14$
$=12\times 2 /100=0.24\,g$
$\therefore C-14$ atoms in $0.24\,g=\frac{0.24\times6.02\times10^{23}}{14}$
$=1.03\times10^{22}$ atoms