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← ScienceWhich outcome results when rapid depressurization causes adiabatic expansion of CO₂?
A)Dry ice formation✓
B)Increased gas density
C)Exothermic reaction initiation
D)Vapor pressure elevation
💡 Explanation
Formation of dry ice occurs because adiabatic expansion causes rapid cooling via the Joule-Thomson effect below CO₂'s triple point, therefore CO₂ solidifies rather than remaining a gas because the energy is lost to expansion, shifting phase.
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