Enthalpy vs Standard Enthalpy

[Andrew Nguyen 2I]

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]

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.