A solid material is known to contain potassium biphthalate KC8H5O4 as well as other inert materials. A 3.025 gram sample of this material is dissolved in 100mL water and titrated with .0875 M potassium hydroxide. It takes 23.78mL of KOH solution to reach the end point. Explain how many moles of KOH were used in the titration?