What happens when dilute hydrochloric acid is added to iron fillings

When $\ce$ What made the reaction with dilute acid different from the reaction with concentrated acid? How did the second equation form, and why there are 2 salts - one with Fe[II] and the other with Fe[III]? In the first equation, $\ce$ - as expected, it is less negative than before, which corresponds to a larger value of $K = \exp(nFE/RT)$. The fact that it is still rather negative just means that there is a difference between the real world and my theoretical treatment. Presumably, those assumptions above are not entirely valid. Just want to be accurate in concepts: Concentrated sulfuric acid is at least $18~\mathrm$ molecules.

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