Stoichiometry
No cooling occurs, when an ideal gas undergoes unrestrained expansion, because the molecules

Are above the inversion temperature
Exert no attractive force on each other
Do work equal to loss in kinetic energy
Collide without loss of energy

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Stoichiometry
In a binary liquid solution of components A and B, if component A exhibits positive deviation from Raoult's law, then component B

Exhibits negative deviation from Raoult's law
Exhibits positive deviation from Raoult's law
Obeys Raoult's law
May exhibit either positive or negative deviation from Raoult's law

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