## q=H

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

### q=H

When does deltaH = q. I remember hearing that q always deltaH, but the reverse is not true? I am unsure if I heard correctly and why this is so/

Ashley Wang 4G
Posts: 103
Joined: Wed Sep 11, 2019 12:16 am

### Re: q=H

q = ∆H(rxn) if the reaction occurs under conditions of constant pressure, just by the definition of enthalpy change (the heat absorbed/released in a reaction at constant pressure).

Nathan Rothschild_2D
Posts: 131
Joined: Fri Aug 02, 2019 12:15 am

### Re: q=H

I believe you have it switched. deltaH is always q, while q is = to deltaH at constant pressure

005162520
Posts: 101
Joined: Tue Sep 24, 2019 12:17 am

### Re: q=H

I know that q is not always delta H, but it can if it is at constant pressure. But why is delta H always q?

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

### Re: q=H

Delta H is equal to q when no work is done onto a system, such as a 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 1 guest