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(Solved): (a) What are the enthalpic processes that occur when two non-ideal pure substances are mixed and wha ...



(a) What are the enthalpic processes that occur when two non-ideal pure substances are mixed and what is the sign of enthalpy associated with each process?

(b) For each pair of components of a mixture under standard conditions, indicate whether the vvapor pressure of the solution obtained is greater, lower, or approximately equal to that of an ideal mixture and also indicate whether the enthalpy of the mixture is positive, negative, or almost zero:

Ethanol and water

Hexane and methanol

Octane and heptane

Acetone and chloroform

Urea (solid) dissolved in water



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Answer a - the enthalpy of mixing (also heat of mixing and excess enthalpy) is the enthalpy liberated or absorbed from a substance upon mixing. When a substance is combined with any other substance the enthalpy of mixing i
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