Consider a rigid vessel containing two chambers separated by a wall or barrier. Argon gas at 25 C and 2 bars is contained in one of the chambers. The other chamber is evacuated (at zero pressure). The entire vessel is insulated. The barrier is punctured and the Argon gas expands to fill the other chamber. Assuming the Argon finally comes to equilibrium filling the entire vessel and that the two chambers have equal volume, determine the change in entropy of the Argon.