The number of moles in $2 \times 10^{24}$ atoms of iron are

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3.3

4.5

5.2

2.1

answer is A.

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Detailed Solution

$\begin{array}{l} 6.023 \times 10^{23} iron atoms \to 1 mole \\ 2 \times 10^{24} iron atoms \to ? \\ \frac{2 \times 10^{24}}{6 \times 10^{23}} = \frac{10}{3} = 3.33 moles \end{array}$

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