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Water is added to the solution such that the mole fraction of water in the solution becomes 0.9. The boiling point of the solution is A) 354.7K B) 375.5K C) 376.2K D) 380.4K?
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Explanation:

Boiling Point Elevation

Boiling point elevation occurs when a non-volatile solute is added to a solvent, which increases the boiling point of the solvent. The boiling point elevation is given by the formula: ΔTb = Kb x molality, where ΔTb is the boiling point elevation, Kb is the molal boiling point elevation constant, and molality is the concentration of the solute in mol/kg of solvent.
Calculation

Given, mole fraction of water, Xw = 0.9
mole fraction of solute, Xs = 0.1
Let's assume that the solute is an electrolyte and it dissociates into two ions in the solution.
So, the concentration of the solute in mol/kg of solvent is given by:
m = 2x / (1-x), where x is the mole fraction of water.
m = 2(0.9) / (1-0.9) = 18 mol/kg.
The molal boiling point elevation constant of water is 0.512 K kg/mol.
So, the boiling point elevation of water is given by:
ΔTb = Kb x molality
ΔTb = 0.512 x 18
ΔTb = 9.216 K
The boiling point of pure water is 373.15 K.
So, the boiling point of the solution is:
Boiling point of solution = 373.15 + ΔTb
Boiling point of solution = 373.15 + 9.216
Boiling point of solution = 382.366 K
Therefore, the boiling point of the solution is approximately 380.4 K. Hence the answer is (D) 380.4K.
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Direction: Read the passage given below and answer the following questions: Boiling point or freezing point of liquid solution would be affected by the dissolved solids in the liquid phase. A soluble solid in solution has the effect of raising its boiling point and depressing its freezing point. The addition of non-volatile substances to a solvent decreases the vapour pressure and the added solute particles affect the formation of pure solvent crystals. According to many researches the decrease in freezing point directly correlated to the concentration of solutes dissolved in the solvent. This phenomenon is expressed as freezing point depression and it is useful for several applications such as freeze concentration of liquid food and to find the molar mass of an unknown solute in the solution. Freeze concentration is a high quality liquid food concentration method where water is removed by forming ice crystals. This is done by cooling the liquid food below the freezing point of the solution. The freezing point depression is referred as a colligative property and it is proportional to the molar concentration of the solution (m), along with vapour pressure lowering, boiling point elevation, and osmotic pressure. These are physical characteristics of solutions that depend only on the identity of the solvent and the concentration of the solute. The characters are not depending on the solute’s identity. Q.When a non volatile solid is added to pure water it will

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Water is added to the solution such that the mole fraction of water in the solution becomes 0.9. The boiling point of the solution is A) 354.7K B) 375.5K C) 376.2K D) 380.4K?
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Water is added to the solution such that the mole fraction of water in the solution becomes 0.9. The boiling point of the solution is A) 354.7K B) 375.5K C) 376.2K D) 380.4K? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Water is added to the solution such that the mole fraction of water in the solution becomes 0.9. The boiling point of the solution is A) 354.7K B) 375.5K C) 376.2K D) 380.4K? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Water is added to the solution such that the mole fraction of water in the solution becomes 0.9. The boiling point of the solution is A) 354.7K B) 375.5K C) 376.2K D) 380.4K?.
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