Enthalpy
Moderators: Chem_Mod, Chem_Admin
-
- Posts: 103
- Joined: Sat Sep 07, 2019 12:18 am
Enthalpy
What does the term "state function" entail? All I've seem to understand from it is that it's only dependent of its current calculated state and that you can add it's values. Other than that, what does "state function" mean?
Re: Enthalpy
A state function means that only the initial state and final state are needed to determine the value. I think Lavelle's example of how only the initial and final destinations matter when you hike a mountain and how the pathway you took is irrelevant explains conceptually what a state function is.
-
- Posts: 49
- Joined: Wed Nov 14, 2018 12:20 am
Re: Enthalpy
The value of state functions are independent of pathways taken to reach their initial/final values. Since pathway becomes inconsequential, the quantity is only dependent on initial and final values.
-
- Posts: 102
- Joined: Sat Sep 14, 2019 12:16 am
-
- Posts: 116
- Joined: Thu Jul 25, 2019 12:15 am
-
- Posts: 100
- Joined: Wed Sep 18, 2019 12:15 am
Re: Enthalpy
The value of a state function is only dependent on the initial value and the final value.
-
- Posts: 112
- Joined: Sat Aug 17, 2019 12:16 am
- Been upvoted: 1 time
Re: Enthalpy
State functions are independent values regardless of the pathway to get to the final value. The quantity only matters based on the final and initial values, and not the pathway to get there.
Re: Enthalpy
Something being a state function means that the pathway by which the value arrived at its final value does not matter in the calculation of the value.
Re: Enthalpy
A state function is a property that states that the path that something takes is irrelevant, the only thing that matters is the final result or final state. d
-
- Posts: 112
- Joined: Sat Aug 17, 2019 12:16 am
- Been upvoted: 1 time
Re: Enthalpy
A state function doesn't rely on the pathway taken, it only relies on the initial and final values.
-
- Posts: 69
- Joined: Mon Jun 17, 2019 7:23 am
Re: Enthalpy
State functions only depend on initial and final values, thus intermediate steps are irrelevant when calculating enthalpy or entropy.
-
- Posts: 81
- Joined: Fri Sep 28, 2018 12:28 am
Re: Enthalpy
Fiona Latifi 1A wrote:Examples of state functions include density, internal energy, enthalpy, and entropy.
Could you also give examples of what would not be a state function?
-
- Posts: 69
- Joined: Mon Jun 17, 2019 7:23 am
Re: Enthalpy
Ivan Tadeja 1G wrote:Fiona Latifi 1A wrote:Examples of state functions include density, internal energy, enthalpy, and entropy.
Could you also give examples of what would not be a state function?
Work is an example of a non-state (path) function
-
- Posts: 114
- Joined: Wed Sep 30, 2020 9:36 pm
Re: Enthalpy
I like to think of it as the state function being something that doesn't concern how you got to where you got to, just where you ended up. In other words, the journey doesn't matter! Only the start and end places.
-
- Posts: 101
- Joined: Fri Oct 02, 2020 12:16 am
Re: Enthalpy
I know it's a bit repetitive hearing the same thing but a state function means that, in order to determine its value, we only need both the initial and final state.
-
- Posts: 138
- Joined: Wed Sep 30, 2020 9:50 pm
- Been upvoted: 1 time
Re: Enthalpy
State function means that you basically only need to consider the final and initial values of that function when calculating changes. Think of it as a "state" function because you only really need to consider the initial and final "states" of the function.
Change = final value - initial value of state function
Change = final value - initial value of state function
-
- Posts: 96
- Joined: Wed Sep 30, 2020 10:09 pm
Re: Enthalpy
A state function is a property that is describing a particular state and doesn't depend on the path taken to reach this state.
-
- Posts: 114
- Joined: Wed Sep 30, 2020 9:45 pm
Re: Enthalpy
Work is not a state function because it depends on the path taken whereas a state function such as enthalpy only depends on the final and initial states.
Re: Enthalpy
State function doesn't consider the path taken, instead it focuses on the final and initial.
-
- Posts: 50
- Joined: Wed Nov 18, 2020 12:23 am
Re: Enthalpy
A state function is independent of the path taken to establish value. State functions in thermochemistry include pressure, volume, temperature, enthalpy, internal energy, Gibbs free energy, and entropy.
-
- Posts: 59
- Joined: Thu Dec 17, 2020 12:20 am
Re: Enthalpy
Enthalpy is a state function. This means that it doesn't relate to the path that it takes to reach the final values. It only corresponds with the initial and final values.
-
- Posts: 100
- Joined: Wed Sep 30, 2020 9:46 pm
Re: Enthalpy
Gicelle Rubin 1E wrote:I know it's a bit repetitive hearing the same thing but a state function means that, in order to determine its value, we only need both the initial and final state.
and then we also subtract final minus initial right?
Return to “Concepts & Calculations Using First Law of Thermodynamics”
Who is online
Users browsing this forum: No registered users and 8 guests