Can you show me how to do these problems please.

Missed THiS? Resd Section? 43( (Cibos 145 - 149) : Watch kCy 4.3. ME 4.4. What mass of HBr (in g) would you need to dissolve a 2.7-g pure iron bar on a padiock? Hydrobromic acid dissolves solid iron according to Express your answer using two significant figures. the following reaction: Fe(s)+2HBr(aq)FeBr2(aq)+H2(g) Part B What mass of H2 would be produced by the complete reaction of the iron bar? Express your answer using two significant figures