Final answer:
To calculate the vapor pressure of water above a solution at 338 K, use Raoult's law. First, calculate the mole fraction of water in the solution. Then, multiply the mole fraction by the vapor pressure of pure water at 338 K to find the vapor pressure of water above the solution.
Step-by-step explanation:
The vapor pressure of a solution can be calculated using Raoult's law. Raoult's law states that the vapor pressure of a solution is equal to the mole fraction of the solvent multiplied by the vapor pressure of the pure solvent. In this case, the solvent is water and the solution is at 338 K.
First, we calculate the mole fraction of water in the solution. The mole fraction is the amount of moles of water divided by the total moles of solute and solvent. Since water is the solvent, the total moles are equal to the moles of water.
The vapor pressure of the solution is then calculated by multiplying the mole fraction of water by the vapor pressure of pure water at 338 K. The result will be the vapor pressure of water above the solution at 338 K.