Enthalpies of physical change The standard enthalpy change that accompanies a change of physical state is called the standard enthalpy of transition and is denoted ∆ trans H o The standard enthalpy of vaporization, ∆ Vap H o is one example.
{"Image DocumentName": "For example, the standard state of liquid ethanol at 298 K is pure liquid ethanol at 298 K and I bar; the standard state of solid iron at 500 K is pure iron at 500 K and 1 bar.", "Image ImageDescription": "The standard enthalpy change for a reaction or a physical process is the difference between the products in their standard states and the reactants in their standard states, all at the same specified temperature. As an example of a standard enthalpy change, the standard enthalpy of vaporization, \u2206Hovap , is the enthalpy change per mole when a pure liquid at 1 bar vaporizes to a gas at 1 bar, as in.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}