Discussion
Arrange the following steps of computing an enthalpy change between two states of a real gas in the usual order.
1. add the residual enthalpy at the final state
2. remove the residual enthalpy at the initial state
3. sum the three contributions
4. change temperature along the ideal gas path
Answer: A
The path is constructed so that the only temperature integration happens where heat capacity data apply, that is in the ideal gas state. The residual terms carry the departure at each end and are supplied by an equation of state.
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