Question

Why does the pressure of ideal gas increase when it is heated at constant volume?

• A. The gas molecules expand
• B. The molecules move at the same speed , but hit the walls more often
• C. The molecules move faster and hit the walls more often
• D. The number of molecules of gas increases

Answer 1

The correct option is C The molecules move faster and hit the walls more often

As we heat at constant volume, internal energy of gas increases and molecules move faster & hit the walls more often.
Thats why pressure of ideal gas increase when it is heated at constant volume.