The vapor pressure of pure water and pure ethanol at $25\backslash$deg C are $24$ Torr and $44$ Torr, respectively. Suppose you have a water $-$ ethanol mixture and the total vapor pressure is $31.2$ Torr. Sucrose, C$12$H$22$O$11,$ is a non $-$ volatile solute that will not contribute to the total vapor pressure. When $0\mathrm{.}03$ moles of sucrose is added to the water $-$ ethanol mixture, the vapor pressure drops to $29\mathrm{.}8$ Torr.

Calculate the moles of water present in the solution.