Advertisements
Advertisements
Question
State Raoult’s law.
Advertisements
Solution 1
Raoult’s law states that the partial vapour pressure of any volatile component of a solution is equal to the vapour pressure of the pure component multiplied by its mole fraction in the solution.
Solution 2
For a solution of volatile liquids, the partial vapour pressure of each component in the solution at a particular temperature is equal to the product of the vapour pressure of the component in the pure state and its mole fraction in the solution.
Mathematically, for a binary solution:
\[\ce{P_A = P{^{\circ}_{A}}\chi_A}\] and
\[\ce{P_B = P{^{\circ}_{B}}\chi_B}\]
The total vapour pressure is:
\[\ce{P_{total} = P_A + P_B = P{^{\circ}_{A}}\chi_A + P{^{\circ}_{B}}\chi_B}\]
Notes
Students can refer to the provided solutions based on their preferred marks.
APPEARS IN
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 ______.
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.
A mixture of benzene and toluene contains 30% by mass of toluene. At 30°C, vapour pressure of pure toluene is 36.7 mm Hg and that of pure benzene is 118.2 mm Hg. Assuming that the two liquids form ideal solutions, calculate the total pressure and partial pressure of each constituent above the solution at 30°C.
Distinguish between ideal and non-ideal solutions.
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?
What are non-ideal solutions?
Explain with reasons and diagrams, the positive and negative deviations from Raoult’s law shown by nonideal solutions.
Which of the following statements is INCORRECT?
Which of the following metals is refined by vapour phase refining in Mond process?
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.
5.0 g of sodium hydroxide (molar mass 40 g mol-1) is dissolved in little quantity of water and the solution is diluted upto 100 mL. What is the molarity of the resulting solution?
A solution of acetone in ethanol ______.
18 g of glucose (C6H12O6) is added to 178.2 g of water. The vapour pressure of water for this aqueous solution at l00°C is ______.
For an ideal binary liquid solution with `"p"_"A"^circ > "P"_"B"^circ`, which is a relation between XA (mole fraction of A in liquid phase) and YA (mole fraction of A in vapour phase) is correct, XB and YB are mole fractions of B in liquid and vapour phase respectively?
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?
State Raoult’s law for solutions containing volatile solutes.
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.
The solutions that obey Raoult's law over entire range of concentrations are ______.
Which one of the following is not correct for an ideal solution?
