45. water is added to the solution M such that the mole fraction of water in the solution becomes 0.9 the booling point of this solution is a) 380.4 k b) 376.2 k c) 375.5 k d) 354.7 k

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Q. Water is added to the solution M such that the mole fraction of water in the solution becomes 0.9. The boiling point of this solution is :

Q. A solution M is prepared by mixing ethanol and water. The mole fraction of ethanol in the mixture is 0.9. Water is added to the solution M such that the fraction of water in the solution becomes 0.9. The boiling point of this solution is :

Properties such as boiling point, freezing point and vapour pressure of a pure solvent change when solute molecules are added to get homogeneous solution. These are called colligative properties. Applications of colligative properties are very useful in day-to - day life.
One of its examples is the use of ethylene glycol and water mixture as anti-freezing liquid in the radiator of automobiles.
A solution M is prepared by mixing ethanol and water. The mole fraction of ethanol in the mixture is 0.9.
Given, freezing point depression constant of water
$(K_{f}^{w a t e r}) = 1.86 K k g m o l^{- 1}$
Freezing point depression constant of ethanol
$(K_{b}^{w a t e r}) = 2.0 K k g m o l^{- 1}$
Boiling point elevation constant of water
$(K_{b}^{w a t e r}) = 0.52 K k g m o l^{- 1}$
Boiling point elevation constant of ethanol
$(K_{b}^{e t h a n o l}) = 1.2 K k g m o l^{- 1}$
Standard freezing point of water = 273 K
Standard freezing point of ethanol = 155.7 K
Standard boiling point of water = 373 K
Standard boiling point of ethanol = 351.5K
Vapour pressure of pure water = 32.8 mm Hg
Vapour pressure of pure ethanol = 40 mm Hg
Molecular weight of water $= 18 g m o l^{- 1}$
Molecular weight of ethanol $= 46 g m o l^{- 1}$
In answering the following questions, consider the solutions to be ideal dilute solutions and solutes to be non-volatile and non-dissociative.

Water is added to the solution M such that the mole fraction of water in the solution becomes 0.9. The boiling point of this solution is -

Q. The vapour pressure of a solution having 0.9 mole fraction of water in ethanol water is :

Q. The vapour pressure of a solution having 0.9 mole fraction of ethanol in ethanol-water is:

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