Difference between Delta H and q?

Moderators: Chem_Mod, Chem_Admin

jonathanshi_1A
Posts: 22
Joined: Fri Jul 22, 2016 3:00 am

Difference between Delta H and q?

Postby jonathanshi_1A » Sun Feb 19, 2017 9:54 pm

I'm a little confused as to the difference between the two, as they both have to do with heat.

Rachel_Prescott_2M
Posts: 10
Joined: Wed Sep 21, 2016 2:57 pm
Been upvoted: 1 time

Re: Difference between Delta H and q?

Postby Rachel_Prescott_2M » Sun Feb 19, 2017 10:08 pm

q is the amount of heat transferred to a system whereas is used to describe the change in enthalpy. Enthalpy is the total potential energy of a system, which is associated with the heat transferred to/from a system (q). However, at constant pressure which can make it difficult to see the difference between what the two values are. Hope this helped a bit!

jeree pucan
Posts: 20
Joined: Wed Nov 18, 2015 3:00 am

Re: Difference between Delta H and q?

Postby jeree pucan » Tue Feb 21, 2017 7:31 am

I guess in simpler terms you can say q = heat in general, whereas H (enthalpy) = qp which is heat at a constant pressure.

Tycho_Meimban_2B
Posts: 31
Joined: Wed Sep 21, 2016 2:57 pm

Re: Difference between Delta H and q?

Postby Tycho_Meimban_2B » Tue Feb 21, 2017 10:25 am

Q is the energy transfer due to thermal reactions such as heating water, cooking, etc. anywhere where there is a heat transfer. You can say that Q (Heat) is energy in transit.

Enthalpy (Delta H), on the other hand, is the state of the system, the total heat content.

They both can deal with heat (qp) (Q at constant pressure) = (Delta H) but both Heat and Enthalpy always refer to energy, not specifically Heat.

Hope this helps!


Return to “Heat Capacities, Calorimeters & Calorimetry Calculations”

Who is online

Users browsing this forum: No registered users and 1 guest