physical or phase change

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Delilah Naranjo dis 3j
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Joined: Wed Sep 21, 2016 3:00 pm

physical or phase change

Postby Delilah Naranjo dis 3j » Mon Jan 30, 2017 12:13 pm

I have a question how does sublimation equal

delta H of sub= delta H of fus + delta H of vap????

Posts: 23
Joined: Wed Sep 21, 2016 3:00 pm

Re: physical or phase change

Postby sophianguyen_1N » Mon Jan 30, 2017 2:16 pm

Sublimation is the conversion of a solid directly to a gas. Because enthalpy is a state function, you could also look as this process as a solid becoming a liquid first, and then a gas. The enthalpy value for that process would be the same as the solid substance becoming a gas immediately. Therefore, delta Hsub is also equal to the addition of delta Hfus (solid to liquid) and delta Hvap (liquid to gas).

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