What is the difference between delta H and q?

Moderators: Chem_Mod, Chem_Admin

JeremyPark14B
Posts: 29
Joined: Fri Sep 28, 2018 12:19 am

What is the difference between delta H and q?

Postby JeremyPark14B » Tue Jan 29, 2019 1:44 pm

delta H is the change in heat; the measure of heat; isn't q also a measure of heat? what is the difference between delta H and q?

Camille Marangi 2E
Posts: 60
Joined: Fri Sep 28, 2018 12:26 am

Re: What is the difference between delta H and q?

Postby Camille Marangi 2E » Tue Jan 29, 2019 2:07 pm

Delta H is enthalpy, so it is just the measurement of change in heat *at constant pressure*. So if the reaction takes place at constant pressure, then delta H=q (enthalpy=q).

Kate_Santoso_4F
Posts: 72
Joined: Fri Sep 28, 2018 12:29 am

Re: What is the difference between delta H and q?

Postby Kate_Santoso_4F » Tue Jan 29, 2019 4:13 pm

Enthalpy change (delta h) only applies to reactions done at constant pressure and it is the state of a system while it contains a certain amount of heat. Heat (q) is just the energy that causes those changes and is the energy transferred as a result of a temperature difference.

George Ghaly 2L
Posts: 66
Joined: Fri Sep 28, 2018 12:29 am
Been upvoted: 1 time

Re: What is the difference between delta H and q?

Postby George Ghaly 2L » Tue Jan 29, 2019 8:07 pm

q just refers to heat while delta h refers to the change of heat within a specific reaction under standard and constant pressure


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 0 guests