Choose the correct graph for the mixture of the volatile liquid CS$_2$ and acetone.
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In a mixture of volatile liquids, the vapor pressure of each component depends on its mole fraction, and the total vapor pressure is the sum of the partial vapor pressures according to Raoult's Law. Non-ideal behavior might lead to deviations from this relationship.
To identify the correct graph for the mixture of the volatile liquid CS2 (carbon disulfide) and acetone, we need to understand the nature of their interaction. CS2 and acetone exhibit non-ideal behavior due to weak van der Waals forces and dipole-dipole interactions leading to positive deviation from Raoult's law.
In a positive deviation, the total vapor pressure of the mixture is greater than that predicted by Raoult's law. This occurs because the intermolecular forces between unlike molecules (CS2 and acetone) are weaker than those between like molecules.
The correct graph should show the real behavior of the mixture, which means the total vapor pressure curve will be above the ideal line. In the given options, graph 3 correctly represents this behavior, with the observed vapor pressure lines bulging upwards indicating a positive deviation.
Therefore, the correct option is 3, which accurately represents the positive deviation from Raoult's law for the mixture of CS2 and acetone.
