## Enthalpy

Chloe Alviz 1E
Posts: 102
Joined: Sat Aug 17, 2019 12:17 am

### Enthalpy

When exactly does enthalpy equal "q"? Are there certain conditions we need to follow?

Andrew Pfeiffer 2E
Posts: 101
Joined: Sat Sep 28, 2019 12:16 am

### Re: Enthalpy

If there is no non-expansion work done on the system and the pressure is still constant, then the heat consumed or released by the system will be equal to q.

JohnWalkiewicz2J
Posts: 103
Joined: Thu Jul 11, 2019 12:17 am
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### Re: Enthalpy

In terms of enthalpy, ΔH = q only when pressure is constant.

Janet Nguy 2C
Posts: 115
Joined: Sat Aug 24, 2019 12:17 am

### Re: Enthalpy

q = enthalpy when the pressure is constant, such as in an open system.

ABombino_2J
Posts: 102
Joined: Thu Jul 11, 2019 12:15 am

### Re: Enthalpy

q=enthalpy only when the pressure is constant because no other work is being done.

Areena H 2K
Posts: 81
Joined: Wed Dec 05, 2018 12:18 am

### Re: Enthalpy

When q equals delta H that means that pressure is constant in the system. There is also no other work being done on the system.

Dina Marchenko 2J
Posts: 54
Joined: Thu Jul 25, 2019 12:16 am

### Re: Enthalpy

How does enthalpy or change in enthalpy relate to q when pressure isn't constant?

Maya Beal Dis 1D
Posts: 100
Joined: Sat Aug 17, 2019 12:16 am
Been upvoted: 2 times

### Re: Enthalpy

Do we need to memorize the table in the textbook that tells you which fraction to multiply R by based on if the reactant is an atom or molecule and so forth?

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

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