The product is this guy in half cell number one, the concentration of 0.5005. And this is half cell number two, the reactant, which is found in this half cell number two. So our concentration is zero five. And that's why we divide 0.05 by 0.5. Now, our N number of moles of electrons is two moles, right? Two moles up here on this side and two moles up here on this side.