When a bottle of perfume is opened, odorous molecules mix with air and slowly diffuse throughout the entire room. Is ΔG for the diffusion process positive, negative, or zero? What about ΔH and ΔS for the diffusion?

Gibbs Free Energy (ΔG) is a thermodynamic potential that indicates the spontaneity of a process at constant temperature and pressure. A negative ΔG suggests that a process is spontaneous, while a positive ΔG indicates non-spontaneity. In the case of perfume diffusion, the process is spontaneous as the molecules spread out, leading to a negative ΔG.

Enthalpy (ΔH) is a measure of the total heat content of a system. It reflects the energy required to break intermolecular forces during a process. For diffusion, the enthalpy change is typically small or slightly positive, as the energy required to overcome interactions is minimal compared to the increase in disorder.

Entropy (ΔS) is a measure of the disorder or randomness in a system. During diffusion, the odorous molecules move from a region of higher concentration to one of lower concentration, increasing the overall disorder of the system. This results in a positive ΔS, indicating that the diffusion process contributes to greater randomness in the arrangement of molecules.