A sample of seaweed contains 30.0 mg of iodine per kg . What is the number of iodine atoms in 10 kg of this seaweed? [ $$\(A_{\mathrm{r}}\)$$ value: $$\(\mathrm{I}=126.9 \quad\)$$ Avogadro constant $$\(L=6.02 \times 10^{23} \mathrm{~mol}^{-1}\)$$ ]
A.
\(7.12 \times 10^{19}\)
B.
\(1.42 \times 10^{20}\)
C.
\(7.12 \times 10^{20}\)
D.
\(1.42 \times 10^{21}\)
Exam No：wch11-01-que-20240111 Year：2024 Question No：12
Answer:
D
Knowledge points:
1.Formulae, Equations and Amount of Substance
Solution:
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