Suppose you have a system consisting of one mole nof arsine, kept under a constant pressure of 0.1 bar. At this constant pressure, the temperature of the system is raised starting from room temperature. Use the thermodynamic data given below to solve the following questions:
- At what temperature does the first As gas (either As(g),As4(g) or mixture of both ) appears?
- What is the composition of the gas phase at this T?
- At what T does the solid As disappears?
- At what T is there as much As present as As(g) and as As4(g)?
Clarify all approximations you make.
Delta_f_H(kj.mol-1) Sm(jk-1 mol-1)
As (S) 0.0 35.1
As (g) +302.5 174.2
As4(g) +143.9 314.0
2008-07-16, 10:54 PM
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