Using the phase diagram for CO2, what phase is carbon dioxide in at -60∘C and 15 atm pressure?

1 Answer
Truong-Son N.
Jul 20, 2017

Well, consult the phase diagram.

![https://2012books.lardbucket.org/](useruploads.socratic.org)

And then you literally just read it like any other graph: find your x coordinate and find your y coordinate.

(x,y)≡(P,T)=(15 atm,−60∘C)

And one should easily see that CO2 is a solid at this T and P, as it should be, left of its triple point temperature but higher up than the triple point pressure.

We call this dry ice; once obtained and brought into a laboratory, it spontaneously sublimes.

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