Advertisements
Advertisements
प्रश्न
How is the sign of ΔmixH related to positive deviations from Raoult’s law?
Advertisements
उत्तर
For solutions showing positive deviation from Raoult's law, `Delta H_"mixing" > 0`. This can be explained as follows:
More energy is needed to overcome A-A or B-B interaction forces than is released during the setup of A-B interaction forces during solution formation because the A-B molecular interaction forces are weaker than the A-A or B-B interaction forces. Heat is thus absorbed during the creation of such a solution, and the dissolution process is endothermic. For this reason, `Delta H_"mixing"` is advantageous in this instance.
APPEARS IN
संबंधित प्रश्न
What role does the molecular interaction play in a solution of alcohol and water?
Heptane and octane form an ideal solution. At 373 K, the vapour pressures of the two liquid components are 105.2 kPa and 46.8 kPa respectively. What will be the vapour pressure of a mixture of 26.0 g of heptane and 35 g of octane?
Fill in the blanks by choosing the appropriate word/words from those given in the brackets:
Ideal solutions obey ………. law and they …………. form azeotropic mixtures.
(Henry’s, aldol condensation, absence, do not, ohm, Raoult’s, increases, common ion effect, easily, three, solubility product, ohm-1, two, four, ohm-1, cm2, Cannizzaro, ohm-1 cm-1, zero, decreases, presence)
The molality of a solution containing 1.8 g of glucose dissolved in 250 g of water is
The partial pressure of nitrogen in air is 0.76 atm and its Henry’s law constant is 7.6 × 104 atm at 300 K. What is the mole fraction of nitrogen gas in the solution obtained when air is bubbled through water at 300 K?
Two liquids X and Y on mixing gives a warm solution. The solution is ______.
The mass of a non – volatile solute (molar mass 80 g mol-1) should be dissolved in 92g of toluene to reduce its vapour pressure to 90% ______.
State Raoult law and obtain the expression for lowering of vapour pressure when the nonvolatile solute is dissolved Insolvent.
For ideal solution the volume of mixing of the pure components to form the solution is ____________.
Which relationship is not correct?
Which of the following is an example of a solid solution?
Intermolecular forces between two benzene molecules are nearly of same strength as those between two toluene molecules. For a mixture of benzene and toluene, which of the following are not true?
(i) ∆mix H = zero
(ii) ∆mix V = zero
(iii) These will form minimum boiling azeotrope.
(iv) These will not form ideal solution.
What is “semi permeable membrane”?
Assertion: Molarity of a solution in liquid state changes with temperature.
Reason: The volume of a solution changes with change in temperature.
Assertion: When a solution is separated from the pure solvent by a semipermeable membrane, the solvent molecules pass through it from pure solvent side to the solution side.
Reason: Diffusion of solvent occurs from a region of high concentration solution to a region of low concentration solution.
Upon increase in pressure for dissociation N2O4 into NO2, equilibrium shift towards
Suggest the most important type of intermolecular attractive interaction in the following pair.
n-hexane and n-octane
Suggest the most important type of intermolecular attractive interaction in the following pair.
Methanol and acetone
