Discussion
Arrange the steps of a hypothetical path from a cold liquid to a superheated vapour in order.
1. heat the vapour to the final temperature
2. heat the liquid to its boiling point
3. sum the three enthalpy changes
4. vaporise it at the boiling point
Answer: A
The path is chosen so that each step matches a kind of tabulated data. Any other path between the same end states gives the same total, since enthalpy is a state function. The real process need not follow this path at all.
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