Draw the reversible arrows to find the number of mol and the opposite (like the example in mass). Mr X : Mr Draw the reversible arrows to find the number of mol and the opposite (like the example in mass). Please fill the blank circle based on the arrows you draw before. Please fill the blank circle based on the arrows you draw before. Please fill the blank circle based on the arrows you draw before. (Ar Na=23, O=16, H=1) Please fill the blank circle based on the arrows you draw before. (Ar Na=23, O=16, H=1)