phase changes

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205389184
Posts: 100
Joined: Sat Sep 07, 2019 12:18 am

phase changes

Postby 205389184 » Sun Jan 26, 2020 8:14 pm

How do we make up for a difference in phases when trying to calculate for the total enthalpy? Can you please give an example, thank you!

kevinolvera1j
Posts: 103
Joined: Fri Aug 02, 2019 12:15 am

Re: phase changes

Postby kevinolvera1j » Sun Jan 26, 2020 8:27 pm

If you're trying to incorporate a phase change into your calculation, you must take into which phase change it is. The increase in enthalpy needed to melt ice, is different from the increase in enthalpy needed to boil water. Once you know what kind of phase change you're dealing with, include it in the enthalpy differences of , for example, calculating bond enthalpies.

Chris Charton 1B
Posts: 69
Joined: Mon Jun 17, 2019 7:23 am

Re: phase changes

Postby Chris Charton 1B » Sun Jan 26, 2020 8:36 pm

When calculating total enthalpy you have to account for whether or not the substance is its standard phase. For example if its a gas in its standard state and is currently a liquid, you would have to add the enthalpy of its vaporization to total enthalpy.


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