Enthalpy vs Standard Enthalpy

Moderators: Chem_Mod, Chem_Admin

Andrew Nguyen 2I
Posts: 68
Joined: Fri Sep 29, 2017 7:07 am

Enthalpy vs Standard Enthalpy

Postby Andrew Nguyen 2I » Wed Jan 17, 2018 10:22 pm

Can someone explain the difference between the two - also does standard enthalpy account on a per 1 mole basis while enthalpy with a chemical equation correlate with the coefficients?

Also is there a different symbol for enthalpy and standard enthalpy?

Aya Shokair- Dis 2H
Posts: 58
Joined: Fri Sep 29, 2017 7:07 am

Re: Enthalpy vs Standard Enthalpy

Postby Aya Shokair- Dis 2H » Wed Jan 17, 2018 10:42 pm

Enthalpy is the heat released or absorbed by a system at constant pressure. ΔH
Standard enthalpy has the same definition, however it is measure enthalpy of objects in their standard states.ΔH°
Standard states for a liquid, solid, and gas occur at 1 bar, typically at 25C°
For solutions the standard state is 1M.

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

Who is online

Users browsing this forum: KenRios_Dis2J and 1 guest