The balanced chemical equation for the reaction is:$2NaOH + Al_2O_3 ⟶ 2NaAlO_2 + 3H_2O$The equation shows that there are two atoms of sodium (Na), two atoms of aluminum (Al), six atoms of oxygen (O), two atoms of hydrogen (H) on both sides of the equation, which means the law of conservation of mass is satisfied.The above reaction is an example of double displacement reaction, is a chemical reaction in which the cations and anions of two different compounds exchange places to form two new compounds.Aluminium oxide:1. $Al_2O_3$, aluminum oxide also known as alumina. It is a white, odorless, and tasteless solid substance that occurs naturally as the mineral corundum.2. Aluminum oxide is an excellent insulator.