Answer:
The balanced equation for barium reacting with aqueous aluminum nitrate can be written as:
Ba + 2 Al(NO3)3 → Ba(NO3)2 + 2 Al
(Note: state symbols indicate the physical state of each substance in the reaction. In this case, "Ba" and "Al" are solids, while "Al(NO3)3" and "Ba(NO3)2" are aqueous solutions.)