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### enthalpy of sublimation

Posted: Sat Mar 10, 2018 11:52 pm
Do we need to know the enthalpy of sublimation for the final?

### Re: enthalpy of sublimation

Posted: Sun Mar 11, 2018 11:28 am
I'm pretty sure you need to know all the enthalpies, but they should be on the equations sheet.

### Re: enthalpy of sublimation

Posted: Tue Mar 13, 2018 9:31 pm
I think the only case it would show up is if we know both the Hvapor and Hsolid, which would make Hsublimation = Hvapor - H solid
and in all cases its endothermic and a positive value!

### Re: enthalpy of sublimation

Posted: Tue Mar 13, 2018 11:00 pm
The numerical value should be given to us, but it is important to know the relationship between $H_{vapor}, H_{solid}, and H_{sublimation}$, as stated above!

### Re: enthalpy of sublimation

Posted: Tue Mar 13, 2018 11:15 pm
Hsub can also be deltaH(fusion) + deltaH(vaporization)

### Re: enthalpy of sublimation

Posted: Fri Mar 16, 2018 1:02 am
As long as you know the equation, delta Hsub = Hvapor - Hsolid, or delta Hsub = delta Hfus + delta Hvap, you should be fine. Just remember that sublimation is changing two states, rather than just one phase transition. Since enthalpy is a state function, you can just add the enthalpy of each phase transition to find the enthalpy of sublimation.