Answer:
14.0075torr
Explanation:
to calculate the vapor pressure we use Roault's law (the vapour pressure of a solvent above a solution is directly proportional to the mole fraction of the solvent in the solution)
so
the more fraction of water = 0.801
the mole fraction of glucose =0.199
next calculate the total moles of solute and solvent in solution, which is 0.998mol
vapour pressure of water 20°C =17.5torr
vapour pressure of solution=
mole fraction of water × vapour pressure of water
=0.801×17.5torr
vapour pressure of solution= 14.0075torr
(36.0g of glucose to 14.4g of water is approximately 14.0075torr)
