Problem: The phase diagram for SO2 is shown here.At which of the three points marked in red does SO2(g) most closely approach ideal-gas behavior?

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FREE Expert Solution

In this problem, we are asked which of the three red points would SO2(g) most closely approach ideal-gas behavior.

We can use the phase diagram to answer the given questions

Recall that a phase diagram shows the transition of matter between solid, liquid, and gas phases as temperature and pressure changes.

In a phase diagram, the different phases can be identified by their location:

  • Solid: can be found at high pressure and low temperature.
  • Liquid: can be found between the solid and gas regions.
  • Gas: can be found at low pressure and high temperature.

The given phase diagram is:

  • Let us label the three points as A, B, and C.

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Problem Details

The phase diagram for SO2 is shown here.
The x axis is temperature in degrees C, ranging from negative 100 to 300 with intervals of 100. The y axis is pressure in atmospheres, ranging from 10 superscript -1 to 10 superscript 2 in log scale. Above the vapor pressure curve the phase is liquid, Below and to the right of the vapor pressure curve the phase is gaseous. The super critical fluid phase is to the right of the critical point and above the gas phase.

At which of the three points marked in red does SO2(g) most closely approach ideal-gas behavior?

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Based on our data, we think this problem is relevant for Professor Rogers' class at UTA.