You have a $1\mathrm{.}0000$ liter volumetric flask that

contains absolutely pure water at $25C.$ How many

hydrogen ions are in this flask? $K_w=1\mathrm{.}00{10}^{-14}$

and the density $=1\mathrm{.}000$g$/$mL$.$

How many water molecules remain at equilibrium?