Phase diagrams...carbon dioxide?
Which statements is correct about carbon dioxide?
a. At -50oC and 1 atm, carbon dioxide is in the gaseous state.
b. At 1 atm carbon dioxide sublimes as it warms above the melting point.
c. At -40oC and 8 atm, carbon dioxide is in the liquid state.
d. As the temperature drops from -30oC to a minus -80oC at 10 atm, carbon dioxide freezes.
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Verified answer
a True [dry ice is at -78 C]
b] false; with sublimation there is no melting involved
c] Sounds likely; I would need to see the phase diagram or other data source
d] Sounds likely; ditto