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Mole Concept

How many mole...

Question

How many moles of $F e^{2 +}$ ions are formed, when excess of iron is treated with 50 mL of 4.0 M HCl under inert atmosphere? Assume no change in volume.

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Solution

Here the number of moles of $H_{2} O$ is $n = 4 M \times 0.05 L = 0.2 m o l$
the reaction is as follows,
$F e + 2 H C l \to F e^{+ 2} + H_{2} + 2 C l^{-}$
Hence, 2mol of $H C l$ is required to convert $F e$ to $F e^{+ 2}$
Number of moles of $F e^{+ 2} = \frac{1}{2} \times 0.2 m o l = 0.1 m o l$

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