Use molar mass to convert to moles:
Molar mass Fe = 55.85 g/mol
Molar mass HBr = 80.91 g/mol
Fe(s) + 2 HBr(aq) → FeBr2(aq) + H2(g)
1 mole Fe → 2 moles HBr
Hydrobromic acid dissolves solid iron according to the following reaction:
Fe(s) + 2HBr(aq) → FeBr2(aq) + H2(g)
What mass of HBr (in g) would you need to dissolve a 3.2 -g pure iron bar on a padlock?
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