The system below shows a box with two indistinguishable balls (filled in circles) and four possible positions, with only one ball allowed in each position. Assume that the system starts with a barrier between side 1 and side 2. Calculate the change in entropy if the barrier is removed and the balls are able to freely move to other positions. Give your answer in units of J/K.

The system below shows a box with two indistinguishable balls (filled in circles) and four possible positions, with only one ball allowed in each position. Assume that the system starts with a barrier between side 1 and side 2. Calculate the change in entropy if the barrier is removed and the balls are able to freely move to other positions. Give your answer in units of J/K.