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CH1012
OTHER TRANSITIONS.h
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®
b) Solid Vapour
Sublimation
ln p
= -DHsub/RT + constant
Allotropy - multiple stable phases
in the same physical state eg. Ice I, Ice II ...
in the same physical state eg. Ice I, Ice II ...
P
CO2
1
atm pressure
1) CO2(s) sublimes at -78oC
[ Ice melts at 0oC ]
1) CO2(s) sublimes at -78oC
[ Ice melts at 0oC ]
P
H2O
P
CO2