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

Option 1 - 160 mm of Hg

Option 2 - 168 mm of Hg

Option 3 - 336 mm of Hg

Option 4 - 350 mm of Hg

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Answered by

Vishal Baghel | Contributor-Level 10

5 months ago

Correct Option - 3

Detailed Solution:

n (B) = 3/2
n (B) = 3, n (O) = 2
n (Total) = 3 + 2 = 5
X (B) = n (B) / n (T) = 3/5
X (O) = n (O) / n (T) = 2/5
P (S) = P° (B)X (B) + P° (O)X (O)
P (S) = 280 * (3/5) + 420 * (2/5)
= 336 mm of Hg

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

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