Multiple Choice
Which of the following best explains why the pressure of a sample of gas at constant volume could decrease by 75 mm Hg?
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7. Gases
The Ideal Gas Law Applications
Multiple Choice
Under which conditions does a real gas behave most like an ideal gas?
A
Low temperature and high pressure
B
Low temperature and low pressure
C
High temperature and high pressure
D
High temperature and low pressure
Verified step by step guidance1
Recall that an ideal gas is a theoretical gas composed of many randomly moving point particles that interact only through elastic collisions, with no intermolecular forces and negligible molecular volume.
Understand that real gases deviate from ideal behavior due to intermolecular forces and the finite volume of gas particles, especially at low temperatures and high pressures where particles are closer together.
Recognize that at high temperatures, gas particles have more kinetic energy, which helps overcome intermolecular attractions, making the gas behave more ideally.
Note that at low pressures, gas particles are far apart, reducing the effect of their finite volume and intermolecular forces, which also promotes ideal gas behavior.
Combine these insights to conclude that a real gas behaves most like an ideal gas under conditions of high temperature and low pressure.
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