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]
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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1 Answer
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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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