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JEE MainChemistryModeratePhysical Chemistry

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 vapour pressure of benzene at 20 ºC for a solution
containing 78 g of benzene and 46 g of toluene in torr is:
csathu rFkk VkWyqbZu yxHkx cukrs gSaA 20ºC ij] casthu
g rFkk VkWyqbZu ds 46 g fy, 20º C ij csathu

Show answer and solution
PB=PB0XBP_{B} = P_{B}^{0}XB PB0=75 torr P_{B}^{0} = 75\ torr\
XB=78/78(78/78)+(46/92)=11+0.5=11.5PB=75×11.5=50 torr. X_{B} = \frac{78/78}{(78/78) + (46/92)} = \frac{1}{1 + 0.5} = \frac{1}{1.5}P_{B} = 75 \times \frac{1}{1.5} = 50\ torr.\

Source: Grass-G / CH-27 Chemistry Paper 2 15 Jan.docx

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