Moderators: Chem_Mod, Chem_Admin

Chloe Alviz 1E
Posts: 102
Joined: Sat Aug 17, 2019 12:17 am


Postby Chloe Alviz 1E » Sun Feb 02, 2020 9:16 pm

When exactly does enthalpy equal "q"? Are there certain conditions we need to follow?

Andrew Pfeiffer 2E
Posts: 101
Joined: Sat Sep 28, 2019 12:16 am

Re: Enthalpy

Postby Andrew Pfeiffer 2E » Sun Feb 02, 2020 9:19 pm

If there is no non-expansion work done on the system and the pressure is still constant, then the heat consumed or released by the system will be equal to q.

Posts: 103
Joined: Thu Jul 11, 2019 12:17 am
Been upvoted: 1 time

Re: Enthalpy

Postby JohnWalkiewicz2J » Sun Feb 02, 2020 9:32 pm

In terms of enthalpy, ΔH = q only when pressure is constant.

Janet Nguy 2C
Posts: 115
Joined: Sat Aug 24, 2019 12:17 am

Re: Enthalpy

Postby Janet Nguy 2C » Sun Feb 02, 2020 9:32 pm

q = enthalpy when the pressure is constant, such as in an open system.

Posts: 102
Joined: Thu Jul 11, 2019 12:15 am

Re: Enthalpy

Postby ABombino_2J » Sun Feb 02, 2020 9:36 pm

q=enthalpy only when the pressure is constant because no other work is being done.

Areena H 2K
Posts: 81
Joined: Wed Dec 05, 2018 12:18 am

Re: Enthalpy

Postby Areena H 2K » Sun Feb 02, 2020 10:49 pm

When q equals delta H that means that pressure is constant in the system. There is also no other work being done on the system.

Dina Marchenko 2J
Posts: 54
Joined: Thu Jul 25, 2019 12:16 am

Re: Enthalpy

Postby Dina Marchenko 2J » Mon Feb 03, 2020 12:52 pm

How does enthalpy or change in enthalpy relate to q when pressure isn't constant?

Maya Beal Dis 1D
Posts: 100
Joined: Sat Aug 17, 2019 12:16 am
Been upvoted: 2 times

Re: Enthalpy

Postby Maya Beal Dis 1D » Tue Feb 04, 2020 10:41 am

Do we need to memorize the table in the textbook that tells you which fraction to multiply R by based on if the reactant is an atom or molecule and so forth?

Return to “Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)”

Who is online

Users browsing this forum: No registered users and 2 guests