Advertisements
Advertisements
Question
The vapour pressures of pure liquids A and B are 0.600 bar and 0.933 bar respectively, at a certain temperature.
What is the mole fraction of liquid B in the solution when the total vapour pressure of their mixture is 0.8 bar?
Advertisements
Solution
Given: Vapour pressure of pure liquid A `("P"_1^0)` = 0.600 bar
Vapour pressure of pure liquid B `("P"_2^0)` = 0.933 bar
Total pressure (P) = 0.8 bar
To find: Mole fraction of liquid B in the solution
Formula: P = `("P"_2^0 - "P"_1^0)x_2 + "P"_1^0`
0.8 bar = (0.933 bar − 0.600 bar) x2 + 0.600 bar
∴ 0.8 − 0.600 = 0.333 x2
∴ `x_2 = 0.2/0.333 = 0.6`
Mole fraction of liquid B in the solution is 0.6.
RELATED QUESTIONS
Choose the most correct option.
The vapour pressure of a solution containing 2 moles of a solute in 2 moles of water (vapour pressure of pure water = 24 mm Hg) is ______.
Choose the most correct option.
Vapour pressure of a solution is _______.
Fish generally needs O2 concentration in water at least 3.8 mg/L for survival. What partial pressure of O2 above the water is needed for the survival of fish? Given the solubility of O2 in water at 0 °C and 1 atm-1 partial pressure is 2.2 × 10-3 atm mol/L.
The vapour pressure of water at 20°C is 17 mm Hg. What is the vapour pressure of solution containing 2.8 g urea in 50 g of water?
What type of solutions exhibit positive deviations from Raoult’s law?
What is enthalpy change and volume change of mixing of two components forming an ideal solution?
Distinguish between ideal and non-ideal solutions.
With the help of vapour pressure-temperature curves for solution and solvent, explain why boiling point of solvent is elevated when a nonvolatile solute is dissolved into it.
The vapour pressure of a pure solvent at a certain temperature is 0.0227 bar. What is the vapour pressure of a solution containing 6 g of solute (M = 60 g/mol) in 50 g of solvent?
Which of the following is NOT nonideal solution?
9 gram anhydrous oxalic acid (mol. wt. = 90) was dissolved in 9.9 moles of water. If vapour pressure of pure water is pf the vapour pressure of solution is ______.
If 1 mole of ____________ is added to 1 dm3 of water, the boiling point of water will decrease.
A solution of acetone in ethanol ______.
Total vapour pressure of a mixture of 1 mole A`("p"_"A"^circ = 150 " torr")` and 2 mole B`("p"_"B"^circ = 240 " torr")` is 200 mm. In this case, ______.
What are ideal and non-ideal solutions?
The vapour pressures of two liquids A and B are 80 mmHg and 60 mm Hg respectively at 25°C. What is the vapour pressure of the solution obtained by mixing 3 moles of A and 2 moles of B?
Explain the variation of vapour pressures with mole fractions of binary solutions of two volatile liquids forming ideal solutions.
Write the relationship between mole fraction of solvent and vapour pressure of solution.
A mixture of two liquids A and B have vapour pressures 3.4 × 104 Mn-2 and 5.2 × 104 Nm-2. If the mole fraction of A is 0.85, find the vapour pressure of the solution.
