The correct option for the value of vapour pressure of a solution at 45 º C with benzene to octane in molar ratio 3 : 2 is: [At 45 ° C vapour pressure of benzene is 280 mm Hg and that of octane is 420 mm Hg . Assume Ideal gas]

Question

The correct option for the value of vapour pressure of a solution at 45 º C with benzene to octane in molar ratio 3 : 2 is: [At 45 ° C vapour pressure of benzene is 280 mm Hg and that of octane is 420 mm Hg . Assume Ideal gas], 160 mm of Hg, 168 mm of Hg, 336 mm of Hg, 350 mm of Hg

MARKS App · Accepted Answer

Given: P B ° = 280 mm of Hg , P o ° = 420 mm of Hg X B = 3 5 and X o = 2 5 We know that according to Raoult's Law P T = X B P B ° + X o P o ° = 3 5 × 280 + 2 5 × 420 = 336 mm of Hg

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