## Enthalpy and Heat

rachelle1K
Posts: 109
Joined: Sat Sep 07, 2019 12:16 am

### Enthalpy and Heat

What is the difference between H and q? When would they be equal?

Wendy 1E
Posts: 111
Joined: Sat Aug 17, 2019 12:17 am
Been upvoted: 2 times

### Re: Enthalpy and Heat

Enthalpy (ΔH) is the measure of heat released or absorbed at a constant pressure. q is just heat under any conditions. ΔH would be equal to q only when the heat is released or absorbed at a constant pressure.

Alan Cornejo 1a
Posts: 98
Joined: Fri Aug 30, 2019 12:15 am

### Re: Enthalpy and Heat

Wendy Perez 1E wrote:Enthalpy (ΔH) is the measure of heat released or absorbed at a constant pressure. q is just heat under any conditions. ΔH would be equal to q only when the heat is released or absorbed at a constant pressure.

This is the correct answer, another way to think about it is that you can use the two terms interchangeably when their is no work being done on the system .

ValerieChavarin 4F
Posts: 99
Joined: Wed Sep 18, 2019 12:18 am

### Re: Enthalpy and Heat

enthalpy is the change in heat at constant pressure (at which is can be equal to ), while q is measure of heat under varying conditions.

saigorijavolu2k
Posts: 108
Joined: Sat Sep 28, 2019 12:15 am

### Re: Enthalpy and Heat

Enthalpy is the change in how much heat there is under constant pressure, while heat is the transfer of energy caused by a temp difference

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

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