## Enthalpy

$\Delta U=q+w$

Megan Cao 1I
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?

jisulee1C
Posts: 149
Joined: Thu Jul 25, 2019 12:17 am

### 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.

Gurmukhi Bevli 4G
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.

Fiona Latifi 1A
Posts: 102
Joined: Sat Sep 14, 2019 12:16 am

### Re: Enthalpy

Examples of state functions include density, internal energy, enthalpy, and entropy.

Posts: 116
Joined: Thu Jul 25, 2019 12:15 am

### Re: Enthalpy

A state function relies on initial and final values, not the pathway taken.

Juana Abana 1G
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.

Brandon Valafar
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.

Dan M -3E
Posts: 101
Joined: Wed Sep 18, 2019 12:19 am

### 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.

san_2F
Posts: 118
Joined: Sat Jul 20, 2019 12:15 am

### 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

Brandon Valafar
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.

Chris Charton 1B
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?

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

Work is an example of a non-state (path) function

DominicMalilay 1F
Posts: 107
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.

Gicelle Rubin 1E
Posts: 81
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.

305572629
Posts: 86
Joined: Wed Sep 30, 2020 9:41 pm

### Re: Enthalpy

State functions do not rely on the path taken to get from an initial to final value.

Sam Wentzel 1F 14B
Posts: 129
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

Queena Chu 3E
Posts: 86
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.

Catherine Bubser 2C
Posts: 104
Joined: Wed Sep 30, 2020 9:45 pm

### Re: Enthalpy

The path a state function has/ takes does not matter with regard to its final value.

Jerry_T
Posts: 94
Joined: Wed Sep 30, 2020 9:46 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.

905409193
Posts: 94
Joined: Wed Sep 30, 2020 10:06 pm

### Re: Enthalpy

State function doesn't consider the path taken, instead it focuses on the final and initial.

James_Hankee_1C
Posts: 40
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.

Bryan Le 2K
Posts: 44
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.

Kandyce Lance 3E
Posts: 91
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?

Samir 3I
Posts: 43
Joined: Wed Sep 30, 2020 10:04 pm

### Re: Enthalpy

Yes you subtract the initial state from the final to get the final value

jia207
Posts: 101
Joined: Wed Sep 30, 2020 9:52 pm

### Re: Enthalpy

To get the final value, you would subtract the initial state from the final state.

DPatel_2L
Posts: 70
Joined: Wed Sep 30, 2020 9:41 pm

### Re: Enthalpy

The value is only based on the initial and final value