When does a gas deviate the most from its ideal behavior?
Correct answer: D. At high pressure and low temperature
- A. At low pressure and high temperature
- B. At high pressure and high temperature
- C. At low pressure and low temperature
- D. At high pressure and low temperature
Explanation
At high pressure and low temperature, a gas deviates the most from its ideal behavior. Under these conditions, the gas molecules are close to each other and they exert significant intermolecular forces on each other. Also, the volume of gas molecules becomes a significant portion of the total volume and cannot be neglected. Hence, the correct option is D.
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About Real and Ideal Gases
An ideal gas is modelled as particles with negligible volume and no intermolecular attraction, obeying Boyle's, Charles's and Avogadro's laws through PV = nRT. Real gases deviate from this behaviour, especially at high pressure and low temperature, because particle volume and attractive forces matter; the van der Waals equation explains these corrections.
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