Enthalpy

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Mya Majewski 1L
Posts: 89
Joined: Fri Sep 25, 2015 3:00 am

Enthalpy

Postby Mya Majewski 1L » Tue Jan 29, 2019 12:45 pm

What is the difference between the Enthalpy of Reaction and the Enthalpy of Formation?

Seohyun Park 1L
Posts: 73
Joined: Fri Sep 28, 2018 12:29 am

Re: Enthalpy

Postby Seohyun Park 1L » Tue Jan 29, 2019 1:14 pm

Enthalpy of reaction is how much heat (at constant pressure) the reaction absorbs or gives off (so a more general concept/term). Enthalpy of reaction is how much heat a reaction absorbs/gives off when a compound is formed from its constituent standard elements. An example of this would be the change in enthalpy when CO2 gas forms from Carbon and O2.

Mya Majewski 1L
Posts: 89
Joined: Fri Sep 25, 2015 3:00 am

Re: Enthalpy

Postby Mya Majewski 1L » Tue Jan 29, 2019 2:21 pm

Wait you said enthalpy of reaction for both, which one is which again?

Dina Geotas 4A
Posts: 61
Joined: Fri Sep 28, 2018 12:29 am

Re: Enthalpy

Postby Dina Geotas 4A » Wed Jan 30, 2019 1:17 am

Enthalpy of reaction is first, and enthalpy of formation is second; Enthalpy of reaction is how much heat the reaction absorbs or gives off. Enthalpy of formation is how much heat a reaction absorbs or gives off when a compound is formed.

Philipp_V_Dis1K
Posts: 32
Joined: Fri Sep 28, 2018 12:20 am

Re: Enthalpy

Postby Philipp_V_Dis1K » Wed Jan 30, 2019 11:00 am

The enthalpy of reaction is made up of the separate enthalpies of formation for the molecules involved


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