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 Benzene and toluene form nearly ideal solutions. At 20ºC, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial pressure of benzene at 20ºC for a solution containing 78 g of benzene and 46 g of toluene in torr is     [AIEEE-2005]
  • a)
    25
  • b)
     50
  • c)
    53.5
  • d)
    37.5
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Benzene and toluene form nearly ideal solutions. At 20ºC, the vap...
According to Raoult's law, PB = PdegB XB

PdegB = 75 torr

XB = (78/78)/(78/78+46/92) = 1/1.5

PB = 75 x 1/1.5 = 50 torr
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Most Upvoted Answer
Benzene and toluene form nearly ideal solutions. At 20ºC, the vap...
°C, the vapor pressures of pure benzene and pure toluene are 95.1 mmHg and 28.4 mmHg, respectively.

To determine the vapor pressure of a mixture of benzene and toluene, we can use Raoult's law, which states that the vapor pressure of a component in an ideal solution is equal to the product of the vapor pressure of the pure component and its mole fraction in the solution.

Let's assume that we have a mixture of benzene and toluene with mole fractions xB and xT, respectively.

According to Raoult's law, the vapor pressure of benzene in the mixture (PB) is given by:

PB = xB * P°B

where P°B is the vapor pressure of benzene.

Similarly, the vapor pressure of toluene in the mixture (PT) is given by:

PT = xT * P°T

where P°T is the vapor pressure of toluene.

Since the solution is nearly ideal, we can assume that the total vapor pressure (P) of the mixture is the sum of the vapor pressures of the individual components:

P = PB + PT

Substituting the values given:

P = xB * 95.1 mmHg + xT * 28.4 mmHg

Therefore, the vapor pressure of the mixture of benzene and toluene at 20°C is given by the above equation, where xB and xT are the mole fractions of benzene and toluene, respectively.
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Benzene and toluene form nearly ideal solutions. At 20ºC, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial pressure of benzene at 20ºC for a solution containing 78 g of benzene and 46 g of toluene in torr is [AIEEE-2005]a)25b)50c)53.5d)37.5Correct answer is option 'B'. Can you explain this answer?
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Benzene and toluene form nearly ideal solutions. At 20ºC, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial pressure of benzene at 20ºC for a solution containing 78 g of benzene and 46 g of toluene in torr is [AIEEE-2005]a)25b)50c)53.5d)37.5Correct answer is option 'B'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Benzene and toluene form nearly ideal solutions. At 20ºC, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial pressure of benzene at 20ºC for a solution containing 78 g of benzene and 46 g of toluene in torr is [AIEEE-2005]a)25b)50c)53.5d)37.5Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Benzene and toluene form nearly ideal solutions. At 20ºC, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial pressure of benzene at 20ºC for a solution containing 78 g of benzene and 46 g of toluene in torr is [AIEEE-2005]a)25b)50c)53.5d)37.5Correct answer is option 'B'. Can you explain this answer?.
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