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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?

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?

Grade:11

2 Answers

Arun
25758 Points
2 years ago
According to Raoult's law, the partial vapour pressure of each component in any solution is directly proportional to its mole fraction. ... If the vapour pressure is higher then solution is said to exhibit positive deviation, And if the vapour pressure is lower than the solution than it said to be negtive deviation.
Vikas TU
14149 Points
2 years ago
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.For positive deviation from Raoult's law, ΔmixH has a positive sign. For negative deviation from Raoult's law, ΔmixH has a negative sign.

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