H and Q

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Kimberly 1H
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H and Q

Postby Kimberly 1H » Thu Jan 24, 2019 9:33 pm

What's the difference between H and Q?

Jessica Tsui 1H
Posts: 30
Joined: Fri Sep 28, 2018 12:21 am

Re: H and Q

Postby Jessica Tsui 1H » Thu Jan 24, 2019 9:38 pm

H, enthalpy, is the measure of potential energy change of a chemical reaction in kJ/mol, while q measures heat in joules. H and q are related, in that -H = +q.

Please correct me if I am wrong.

Ana Pedreros
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Joined: Fri Sep 28, 2018 12:19 am

Re: H and Q

Postby Ana Pedreros » Sat Jan 26, 2019 2:07 pm

Enthalpy is the amount of heat, H, released or absorbed at a constant pressure, q.

Noah Fox 1E
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Joined: Fri Sep 28, 2018 12:20 am

Re: H and Q

Postby Noah Fox 1E » Sat Jan 26, 2019 3:15 pm

In Enthalpy delta H is a state function of the holistic change in energy configuration, where as q is the heat flow either into or out of the reaction as a result of the change in delta H
Sources:
https://chem.libretexts.org/Bookshelves ... _Chemistry)/Thermodynamics/Energies_and_Potentials/Enthalpy

Albert Duong 4C
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Re: H and Q

Postby Albert Duong 4C » Sat Jan 26, 2019 3:29 pm

Delta H is the amount of heat absorbed/released at a constant pressure. Therefore, Qp, being quantity of heat at a constant pressure, should be essentially equal to delta H.


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