enthalpy of sublimation






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Stephanie tran 1J
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Joined: Fri Sep 29, 2017 6:04 am

enthalpy of sublimation

Postby Stephanie tran 1J » Sat Mar 10, 2018 11:52 pm

Do we need to know the enthalpy of sublimation for the final?

Tasnia Haider 1E
Posts: 55
Joined: Sat Jul 22, 2017 2:01 am

Re: enthalpy of sublimation

Postby Tasnia Haider 1E » Sun Mar 11, 2018 10:28 am

I'm pretty sure you need to know all the enthalpies, but they should be on the equations sheet.

Kyle Alves 3K
Posts: 46
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Re: enthalpy of sublimation

Postby Kyle Alves 3K » Tue Mar 13, 2018 8:31 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!

Fatima_Iqbal_2E
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Re: enthalpy of sublimation

Postby Fatima_Iqbal_2E » Tue Mar 13, 2018 10:00 pm

The numerical value should be given to us, but it is important to know the relationship between , as stated above!

Rishi Khettry 1L
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Joined: Fri Sep 29, 2017 6:05 am

Re: enthalpy of sublimation

Postby Rishi Khettry 1L » Tue Mar 13, 2018 10:15 pm

Hsub can also be deltaH(fusion) + deltaH(vaporization)

Pooja Nair 1C
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Joined: Thu Jul 13, 2017 2:00 am

Re: enthalpy of sublimation

Postby Pooja Nair 1C » Fri Mar 16, 2018 12:02 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.


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