## What is the difference between delta H and q?

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

### What is the difference between delta H and q?

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?

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?

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?

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)”

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