Washburn corrections internal energy change

The net change is a decrease in the amount of each reactant in its standard state and an increase in the amount of each product in its standard state. The internal energy change of step 2 is AC/(IBP, T ef), whose value is fovmd from Eq. 11.5.8. The internal energy changes of steps 1 and 3 are called Washburn corrections. ... 

The Washburn corrections needed in Eq. 11.5.9 are internal energy changes for certain hypothetical physical processes occurring at the reference temperature T ef involving the substances present in the bomb vessel. In these processes, substances change from their standard states to the initial state of the isothermal bomb process, or change Ixom the final state of the isothermal bomb process to their standard states. 

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