State Functions

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605110118
Posts: 75
Joined: Wed Sep 18, 2019 12:21 am

State Functions

Postby 605110118 » Tue Jan 28, 2020 9:38 am

How would you define state functions, and why is enthalpy not considered one?

anjali41
Posts: 109
Joined: Fri Aug 09, 2019 12:15 am

Re: State Functions

Postby anjali41 » Tue Jan 28, 2020 10:06 am

A state function is a property of a substance that is independent of how the sample was prepared. According to the textbook definition, it seems that enthalpy is listed as a state function.

Jamie Lee 1F
Posts: 106
Joined: Fri Aug 09, 2019 12:16 am

Re: State Functions

Postby Jamie Lee 1F » Tue Jan 28, 2020 10:12 am

A state function is a property of a system that depends on only the current state, irregardless of what path was taken to get there. Some examples include temperature, pressure, and volume. Enthalpy is considered a state function because it depends on the initial and final states, not the path between.

Miriam Villarreal 1J
Posts: 105
Joined: Sat Aug 17, 2019 12:16 am

Re: State Functions

Postby Miriam Villarreal 1J » Wed Jan 29, 2020 8:02 am

A state function is a property whose value does not depend on the path taken to reach that specific value. In contrast, functions that depend on the path from two values are call path functions. Both path and state functions are often encountered in thermodynamics.

Justin Sarquiz 2F
Posts: 106
Joined: Fri Aug 30, 2019 12:15 am

Re: State Functions

Postby Justin Sarquiz 2F » Wed Jan 29, 2020 8:40 am

In addition, enthalpy is a state function because you can add and subtract enthalpy values.

ValerieChavarin 4F
Posts: 99
Joined: Wed Sep 18, 2019 12:18 am

Re: State Functions

Postby ValerieChavarin 4F » Thu Jan 30, 2020 4:17 pm

Enthalpy is considered a state function as it is dependent on initial and final states.

Ashley Alvarado 2C
Posts: 45
Joined: Sat Aug 17, 2019 12:16 am

Re: State Functions

Postby Ashley Alvarado 2C » Thu Jan 30, 2020 4:48 pm

Enthalpy would be considered a state function, meaning it must be able to be added. Change in enthalpy can be added to give the total enthalpy change.

annikaying
Posts: 94
Joined: Sat Sep 14, 2019 12:16 am

Re: State Functions

Postby annikaying » Thu Jan 30, 2020 5:00 pm

A state function is something that is not dependent on how you get to the end result. For enthalpy, it doesn't matter how you get to the value therefore it is a state function. This also implies that state functions are additive.

Uisa_Manumaleuna_3E
Posts: 60
Joined: Wed Sep 21, 2016 2:56 pm

Re: State Functions

Postby Uisa_Manumaleuna_3E » Thu Jan 30, 2020 7:22 pm

My TA explained that when we think of state reactions, it's like asking someone what floor of a building they're on. You say, "What floor are you on?" and the person responds with "first floor" or "second floor" or something like that. In order to know the answer to your question, you don't need to know how long the person was in the elevator or if they stopped to talk to a friend or anything like that.

State functions work just like that. All you want to know is where you started and/or where you ended up. Enthalpy is one of those functions.

kristi le 2F
Posts: 102
Joined: Thu Jul 11, 2019 12:15 am

Re: State Functions

Postby kristi le 2F » Sun Feb 02, 2020 10:38 pm

A state function is a property that depends only on the current state of a system, independent on how the state was prepared. For example, internal energy, pressure, volume, temp, and density are state functions. Work and heat are not.


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