What is meant by positive and negative deviations from Raoult-s law and how is the sign of -mixH related to positive and negative deviations from Raoult-s law-

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Question

What is meant by positive and negative deviations from Raoult's law and how is the sign of $Δ_{m i x} H$ related to positive and negative deviations from Raoult's law?

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Solution

Positive deviation from Raoult's law occurs when the total vapour pressure of the solution is more than corresponding vapour pressure in case of ideal solution.

$P = P_{A} + P_{B} > P_{A}^{o} X_{A} + P_{B}^{o} X_{B}$

Negative deviation from Raoult's law occurs when the total vapour pressure of the solution is less than corresponding vapour pressure in case of the ideal solution.

$P = P_{A} + P_{B} < P_{A}^{o} X_{A} + P_{B}^{o} X_{B}$

For positive deviation from Raoult's law, $Δ_{m i x} H$ has a positive sign.

For negative deviation from Raoult's law, $Δ_{m i x} H$ has a negative sign.

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What is meant by positive and negative deviations from Raoult's law and how is the sign of ΔmixH related to positive and negative deviations from Raoult's law?

What is meant by positive and negative deviations from Raoult's law and how is the sign of $Δ_{m i x} H$ related to positive and negative deviations from Raoult's law?