5. A 2.0 L container with 2.00 atm Ar gas is connected by a stopcock to 4.0 L container containing 1.0 atm Kr gas. Which statement accurately describes the system after the stopcock is opened and the system is allowed to reach equilibrium? The temperature is 25 °C throughout the experiment. (A) The total pressure is 2.0 atm. (B) The number of moles of Ar in the 2.0 L container is equal to the number of moles of Kr in the 4.0 L container. (C) The average speed of the Ar atoms is equal to the average speed of the Kr atoms. (D) The partial pressure of Ar is equal to the partial pressure of Kr. (E) The partial pressure of Ar is larger than the partial pressure of Kr.