Enthalpy is said to be additive

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Andrea_Torres
Posts: 98
Joined: Sun Sep 15, 2019 12:15 am

Enthalpy is said to be additive

Postby Andrea_Torres » Sun Jan 26, 2020 7:07 pm

What does it mean for something to be additive?

Julie Park 1G
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Joined: Thu Jul 25, 2019 12:15 am

Re: Enthalpy is said to be additive

Postby Julie Park 1G » Sun Jan 26, 2020 7:09 pm

It's saying that since enthalpy is a state property (not dependent on the path taken to obtain that state), enthalpies can be added (and subtracted).
For example, Hproducts - Hreactants = Change in H

WesleyWu_1C
Posts: 117
Joined: Thu Jul 25, 2019 12:16 am

Re: Enthalpy is said to be additive

Postby WesleyWu_1C » Sun Jan 26, 2020 7:54 pm

One of the examples that Dr. Lavelle gave for another state property is altitude. For altitude, the path doesn't matter. What matters is where the hiker ends up.

Jasmine 2C
Posts: 184
Joined: Wed Sep 18, 2019 12:18 am

Re: Enthalpy is said to be additive

Postby Jasmine 2C » Sun Jan 26, 2020 8:02 pm

it basically means the delta H values can be added together (even if it's a negative number, which will just make the addition into a subtraction)

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

Re: Enthalpy is said to be additive

Postby kevinolvera1j » Sun Jan 26, 2020 8:21 pm

Because Enthalpy is a state function, only the state matters. In other words, what matters is the state, not the way that those states were obtained or the path that led them there. This is what allows enthalpy to be additive.

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

Re: Enthalpy is said to be additive

Postby Chris Charton 1B » Sun Jan 26, 2020 8:40 pm

This is because Enthalpy is a state property. Only the initial and final values are relevant, the path taken to get to the final value does not matter.

gabbymaraziti
Posts: 111
Joined: Wed Sep 18, 2019 12:19 am

Re: Enthalpy is said to be additive

Postby gabbymaraziti » Sun Jan 26, 2020 9:02 pm

Enthalpy is additive because it is a state function, meaning it can be added or subtracted.

Eesha Chattopadhyay 2K
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Joined: Fri Aug 09, 2019 12:16 am

Re: Enthalpy is said to be additive

Postby Eesha Chattopadhyay 2K » Sun Jan 26, 2020 9:05 pm

being additive means that different enthalpies of different reactions can be added. this is true because enthalpy is a state function.

RasikaObla_4I
Posts: 100
Joined: Thu Jul 25, 2019 12:15 am

Re: Enthalpy is said to be additive

Postby RasikaObla_4I » Sun Jan 26, 2020 9:28 pm

Because enthalpies of different reactions can be added together, it is said to be additive.

Nare Nazaryan 1F
Posts: 101
Joined: Fri Aug 09, 2019 12:17 am

Re: Enthalpy is said to be additive

Postby Nare Nazaryan 1F » Sun Jan 26, 2020 9:41 pm

It just means that, since enthalpy is a state property, different enthalpies can be added together.

805422680
Posts: 103
Joined: Sat Sep 14, 2019 12:16 am

Re: Enthalpy is said to be additive

Postby 805422680 » Sun Jan 26, 2020 9:53 pm

enthalpies of different reactions can be added together to get the total enthalpy of the system in its change from reactants to products


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