Question

All real gases behave like an ideal gas at:

• A. High pressure and low temperature
• B. Low temperature and low pressure
• C. High pressure and high temperature
• D. At all temperatures and pressures
• E. Low pressure and high temperature

Hint:

Real gases behave most like ideal gases at low pressure and high temperature, where intermolecular forces are minimal, and the volume of gas molecules becomes insignificant.

Answer 1

Answer: (E)

Real gases deviate from ideal gas behavior at high pressure and low temperature. At high pressure, intermolecular forces become significant, and at low temperature, the gas particles are too close for the ideal gas assumptions to hold true.
On the other hand, at low pressure and high temperature, the gas particles are far apart and move quickly, which minimizes the effect of intermolecular forces. In this case, real gases behave most like ideal gases because the volume of individual gas molecules becomes negligible compared to the total volume, and intermolecular forces are not significant.
Thus, the ideal gas behavior is most closely approximated under low pressure and high temperature conditions.
Thus, the correct answer is option (E), low pressure and high temperature.