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7.4 moles of iron weigh

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111.1g

212.2g

414.4g

112g

answer is C.

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Detailed Solution

1 Mole iron (Fe) weighs 56g.

So, weight of 7.4 moles iron is

$\begin{array}{l} = \frac{56 g}{1 mol} \times 7.4 mol \\ = 414.4 g \end{array}$

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