Equations for enthalpy

[Karen Elrayes 1L]

What are all version of enthalpy (delta H) equations we need to know at the different conditions? constant P, constant V, etc...

[Jessica Katz]

the standard enthalpy of formation is just using the delta H of the products - delta H of the reactants. Then when there is constant pressure qp = delta H but that is used when using the delta U equation and that becomes deltaU = delta H - PdeltaV. When there is constant volume, that means the system is doing no work so, U = q. I'm not sure this is exactly the answer you were looking for but hope this helps.

[Susanna Givan 2B]

Are you asking about CV, Cp? Etc? Because typically that's given by the R value.