Using the phase diagram for #CO_2#, 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/

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 #"CO"_2# 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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