1) When iron rusts, solid iron reacts with gaseous oxygen to form solid iron(III) oxide. (Enter a balanced chemical equation for this reaction. Express your answer as a chemical equation. Identify all of the phases in your answer.)

2) Hydrobromic acid dissolves solid iron according to the following reaction: Fe(s)+2HBr(aq)FeBr2(aq)+H2(g)

a) What mass of HBrHBr (in gg) would you need to dissolve a 2.8-gg pure iron bar on a padlock? (Express your answer using two significant figures.)

b) What mass of H2H2 would be produced by the complete reaction of the iron bar? (Express your answer using two significant figures.)

3) Sulfuric acid dissolves aluminum metal according to the following reaction: 2Al(s)+3H2SO4(aq)Al2(SO4)3(aq)+3H2(g)2Al(s)+3H2SO4(aq)Al2(SO4)3(aq)+3H2(g) Suppose you wanted to dissolve an aluminum block with a mass of 14.6 g.

a) What minimum mass of H2SO4H2SO4 would you need? (Express your answer in grams.)

b) What mass of H2H2 gas would be produced by the complete reaction of the aluminum block? (Express your answer in grams.)