Mole ConceptMedium
Question
If isotopic distribution of C12 and C14 is 98.0% and 2.0%, respectively, then the number of C14 atoms in 12 g of carbon is
Options
A.1.032 × 1022
B.1.20 × 1022
C.5.88 × 1023
D.6.02 × 1023
Solution
Average atomic mass of C = $\frac{12 \times 98 + 14 \times 2}{100} = 12.04$
Number of C14 atoms = $\frac{2}{100} \times \frac{12}{12.04} \times 6.022 \times 10^{23} = 1.20 \times 10^{22}$
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