Solid aluminum is added to a solution of sulfuric acid and
hydronium (hydrated hydrogen) ions, forming a solution that
consists of aluminum(III) ion, liquid water, and solid sulfur.
(a)    Using a table of standard reduction
potentials, write the half-reaction equations for each of the redox
reactions indicated.
(b)    Modify the half-reactions, if
necessary, and add them to yield a balanced net ionic equation.
(c)    Calculate E° for the reaction as
written.
(d)    State and justify the favored
direction of the reaction.