APFIVE Molecular Basis of Charles's Law
A gas sample in a cylinder with a movable piston has an initial volume of 2.0 L at 300 K and 1.0 atm. If the temperature is increased to 450 K while the pressure is held constant, which of the following best explains the molecular basis for the resulting change in volume?
A
Gas molecules expand individually at higher temperatures
B
The average molecular mass decreases at higher temperatures
C
Increased molecular kinetic energy leads to more frequent and forceful collisions with container walls
D
Intermolecular forces weaken, allowing molecules to separate
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