3. An ideal gas is held in a container of volume V and at pressure P. Gas is pumped into the container so that the number of molecules doubles and heat is added so that the average kinetic energy of the gas also doubles. The volume is adjusted so that the pressure remains constant. What is the new volume of the container?
B
Explanation:
The average kinetic energy doubles which means that the temperature doubles. To maintain constant pressure, volume would have to double.
Since the number of molecules also doubles, volume would have to double again to maintain constant pressure.
Thus the volume must get 4 times larger from pV=nRT