The balanced molecular equation for the reaction between KI and AgNO3 is written as KI + AgNO3 = AgI + KNO3. For an equation to be balanced, it must contain the same number of atoms on both its left and right sides.
In the equation KI + AgNO3 = AgI + KNO3, the potassium iodide and the silver nitrate react to form silver iodide and potassium nitrate. Equations are balanced using a technique called stoichiometry, with multiple molecules of a compound indicated by a stoichiometric coefficient. The compounds on the left side of the equation are called the reactants, and the compounds on the right side are called the products.