Sublimation temperature of dry ice (solid CO2) is ____________ °C?
Correct answer: C. -78
- A. -273
- B. 0
- C. -78
- D. 5
Explanation
At approximately atmospheric pressure, solid carbon dioxide sublimes at about −78.5°C, so −78°C is the nearest option. Dry ice does not melt at atmospheric pressure because it changes directly from solid to vapour.
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