Solutions Question 117

Question: Benzene and toluene form nearly ideal solutions. At 20°C, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The parial vapour pressure of benzene at 20°C for a solution containing 78g of benzene and 46g of toluene in torr is [AIEEE 2005]

Options:

A) 50

B) 25

C) 37.5

D) 53.5

Show Answer

Answer:

Correct Answer: A

Solution:

PB = $ P_B^{o}X_{B} $ ; \ $ P_{B}=\frac{\frac{78}{78}}{\frac{78}{78}+\frac{46}{92}}\times 75 $ ; \ PB = 50 torr



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