01 Molecular Interaction

When pure, Acetone molecules are held together by dipole-dipole interactions, and Chloroform molecules by weak van der Waals forces. However, mixing them creates a new, stronger force.

02 Enthalpy Change ($\Delta H$)

Bond formation releases energy. In this mixture, the new H-bonds are stronger than the original intermolecular forces of the pure liquids.

[Image of exothermic reaction energy diagram]

• The excess energy is released as heat.
• $\Delta H_{mix}$ is Negative (Exothermic).

03 Raoult's Law Deviation

Because the molecules attract each other strongly, they escape into the vapor phase less easily than expected.

[Image of negative deviation from Raoult's law graph]