Question

An open beaker of water in equilibrium with water vapour is in sealed container. When a few grams of glucose are added to the beaker of water, the rate at which water molecules:

Options

• Leaves the vapour decreases

• Leaves the solution decreases

• Leaves the vapour increases

• Leaves the solution increases

Answer 1

Leaves the vapour increases

Explanation:

The vapour pressure of the pure solvent is higher than that of the solution. When a few grammes of glucose are added to a beaker of water, the vapour pressure of the solution is lower than the vapour pressure of the pure solvent. Some vapour molecules will be converted into liquid water in order to maintain the new equilibrium.