25 g of iron was dissolved in an excess of dilute hydrochloric acid. Calculate the amount of gas released as a result of this reaction.

Compose a reaction equation
Fe + 2HCl = FeCl2 + H2
Calculate the amount of iron substance 25 g / 56g / mol = 0.45 mol
Calculate the amount of gas substance (hydrogen) = 0.45 mol (equal to the amount of iron substance)
Calculate the volume of hydrogen V = 0.45 mol * 22.4 l / mol = 10 l.

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