A hollow container is filled with an ideal gas. The container is designed to maintain a constant pressure by allowing gas to enter or leave as needed. At all times, the gas and container are in thermal equilibrium. Initially, the temperature is 2460 K. Then the temperature decreases to 600 K, and the volume decreases to 0.82 times the initial volume. Determine the coefficient of volume expansion for the container and the ratio of the final number of moles to the initial number of moles.
Pcontainer = ___K⁻¹
nf / ni = ____