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Ch.15 - Chemical Equilibrium
Brown - Chemistry: The Central Science 14th Edition
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoBrown 14th EditionCh.15 - Chemical EquilibriumProblema 98d
Capitolo 15, Problema 98d

The phase diagram for SO2 is shown here. (d) At which of the three points marked in red does SO2(g) most closely approach ideal-gas behavior?
Phase diagram for SO2 showing solid, liquid, and gas phases with points A, B, C, and D marked.

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Identify the conditions under which a gas behaves ideally: low pressure and high temperature.
Examine the phase diagram and locate the points A, B, C, and D.
Determine the pressure and temperature at each point: A (low pressure, low temperature), B (low pressure, moderate temperature), C (moderate pressure, high temperature), D (high pressure, high temperature).
Compare the conditions at each point to the ideal gas conditions.
Conclude that the point with the lowest pressure and highest temperature is where SO2(g) most closely approaches ideal-gas behavior.

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Ideal Gas Behavior

Ideal gas behavior refers to the theoretical condition where a gas perfectly follows the ideal gas law (PV=nRT) without deviations. This occurs at high temperatures and low pressures, where intermolecular forces are negligible, and the volume of gas particles is insignificant compared to the volume of the container. Understanding this concept is crucial for identifying conditions under which real gases, like SO2, behave more like ideal gases.
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Ideal Gas Law Formula

Phase Diagram

A phase diagram is a graphical representation that shows the phases of a substance (solid, liquid, gas) at various temperatures and pressures. It helps visualize the conditions under which a substance exists in different states and the transitions between these states. In the context of the question, the phase diagram for SO2 indicates the regions where the gas phase is stable and where it may exhibit ideal behavior.
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Phase Changes in Diagrams

Critical Point

The critical point on a phase diagram marks the end of the liquid-gas phase boundary, beyond which the distinction between liquid and gas phases disappears. At this point, the substance exhibits unique properties, and the behavior of gases can deviate significantly from ideal conditions. Recognizing the critical point is essential for understanding where SO2 may approach ideal gas behavior, particularly in relation to the marked points in the diagram.
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