200 mmHg and 400 mmHg are the vapour pressures of pure liquid components, CHCl3 and CH2Cl2, respectively which forms an ideal binary solution. If 0.75 is the mole fraction of CHCl3, then the total vapour pressure of the solution will be

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250 mmHg

200 mmHg

400 mmHg

350 mmHg

answer is A.

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Detailed Solution

PT=PCHCl3o×χCHCl3+PCH2Cl20×χCH2Cl2= (200 × 0.75) + (400 × 0.25)= 150 + 100= 250 mm Hg

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