To find the mole ratio of BaCl2 to AgCl, we need to determine the number of moles of each compound involved in the reaction. Let's assume we have a balanced chemical equation for the reaction between BaCl2 and AgCl:

BaCl2 + 2AgCl → BaCl2 * 2AgCl

From the balanced equation, we can see that 1 mole of BaCl2 reacts with 2 moles of AgCl. Therefore, the mole ratio of BaCl2 to AgCl is 1:2.