Non-ideal solutions by definition cannot be dealt with through Raoult's Law. Raoult's Law is strictly for ideal solutions only. A non-ideal solution. The interactions between the two types of molecules are weaker than interactions between acetone molecules (pure substance).

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A non-ideal solution is a solution that does not abide to the rules of an ideal solution where the interactions between the molecules are identical (or very close) to the interactions between molecules of different components. ... We assume ideal properties for dilute solutions.

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