Effect of Approximations on Calculated Phase Boundaries

To see the effect of the AC° = 0 and AC° = constant approximations on the calculated position of the calcite-aragonite phase boundary, we use equation (7.50) to generate high temperature ArG values. Thus 

Another more satisfactory alternative is to use the average AC° over the AT considered, rather than AC° for 298.15 K. The results using this assumption are also 

Show that the work done by an ideal gas in an adiabatic reversible expansion is P2V2 — P V )/ y — 1). Verify the statement in the text that an ideal monatomic gas with 7=1.667 would do more than twice the work between points A and B (Table 8.1). 

Calculate i Vo — for the Joule-Thompson expansion considered in the text, and verify that the result is the same as Ud — U.  

Repeat the Isenthalpic Boiling calculation in the text using the Steam Table data and the equation on p. 4 in Henley et al. (1984), and verily that you get the same result. 

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