Hydrobromic acid dissolves solid iron according to the following unbalanced equation: Fe (s) +  HBr (aq) → FeBr2 (aq) + H2 (g)  a. What mass of HBr (in g) would dissolve a 4.8-g pure iron bar on a padlock?  b. What mass of H2 would be produced by the complete reaction of the iron bar?

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