Iron reacts with hydrochloric acid to produce iron (II) chloride and hydrogen gas. If 2.2 grams of iron react with excess hydrochloric acid in a 10.0 L flask at 25°C, what is the pressure of the hydrogen gas in this flask in mm Hg?

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D=m/v =57.9/3 = 19.3 g/cm^3

Reducing agents  oxidized by the reaction