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In gas phase the ratio of excluded volume to molecular volume for a spherical molecule is
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In gas phase the ratio of excluded volume to molecular volume for a sp...
Introduction
In the study of gases, understanding the excluded volume and molecular volume is crucial for characterizing molecular interactions. The excluded volume refers to the space around a molecule that is inaccessible to other molecules due to repulsive forces, while molecular volume is the actual volume occupied by a molecule itself.
Excluded Volume
- The excluded volume for a spherical molecule can be visualized as a larger sphere encompassing the original molecule.
- This larger sphere accounts for the space around the molecule that cannot be occupied by others, creating a "no-go zone" around it.
Molecular Volume
- The molecular volume of a spherical molecule is essentially the volume of that molecule, often calculated using the formula for the volume of a sphere (4/3 πr³), where r is the radius of the molecule.
Ratio of Excluded Volume to Molecular Volume
- For a spherical molecule, the excluded volume (V_excluded) can be approximated as a function of the molecular volume (V_molecular).
- The ratio of excluded volume to molecular volume is generally expressed as V_excluded / V_molecular.
Typical Value
- This ratio is approximately 3 for spherical molecules. This means that the excluded volume is about three times the actual volume of the molecule.
- The larger excluded volume accounts for the interactions and the space needed to prevent other molecules from entering this zone.
Conclusion
Understanding the ratio of excluded volume to molecular volume is essential for grasping the behavior of gases, especially in contexts like gas laws and molecular dynamics.
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In gas phase the ratio of excluded volume to molecular volume for a spherical molecule is
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