80 mole percent of is dissociated in aqueous solution. The vapour pressure of 1.0 molal aqueous solution of at 38°C is mm Hg. (Nearest integer)

Given: Vapour pressure of water at 38°C is 50 mm Hg

Question

80 mole percent of  is dissociated in aqueous solution. The vapour pressure of 1.0 molal aqueous solution of  at 38°C is  mm Hg. (Nearest integer)

Given: Vapour pressure of water at 38°C is 50 mm Hg

Canvas Classes · Accepted Answer

Strategy:
 Calculate the van't Hoff factor () for  from the degree of dissociation, find the mole fraction of the solvent in the solution, and use Raoult's Law to determine the final vapour pressure.

Step 1: Calculate van't Hoff factor ()
 (). Degree of dissociation .

Step 2: Calculate moles for 1.0 molal solution
- Moles of solute particles = 
- Moles of water (solvent) in 1 kg =

Step 3: Determine mole fraction of solvent ()

Step 4: Calculate vapour pressure of solution
 at 38°C.

Roundi

More questions from Solutions