How do you balance Kl --- K plus I2?

To balance the reaction ( \text{Kl} \rightarrow \text{K} + \text{I}_2 ), you start by recognizing that each molecule of iodine (( \text{I}_2 )) contains two iodine atoms. Therefore, you need two potassium iodide (Kl) molecules to provide the two iodine atoms. The balanced equation is ( 2 \text{Kl} \rightarrow 2 \text{K} + \text{I}_2 ), ensuring that both the potassium and iodine atoms are equal on both sides of the equation.