A 400-L Container Is Divided into Two Equal Parts by a a Rubber

Multiple Choice

A 40.0-L container is divided into two equal parts by a rubber membrane. One half of the container has 1.50 moles of an ideal monatomic gas at 250 K, and the other half is a vacuum. The container is well insulated, so there is no exchange of heat with the surroundings. The membrane breaks, and eventually the gas reaches a new equilibrium condition occupying the entire volume. What is the final temperature of the gas?

A) 100 K
B) 125 K
C) 157 K
D) 180 K
E) 250 K