T 400 K K Practice Problem:v The free expansion of an ideal gas is shown in the figure on the right. An isolated box with volume 2V contains n moles of ideal gas at temperature T. Initially, the gas occupies only half of the volume of the box, whereas the other half is a vacuum (empty space). When the O gas expands to fill the whole box, what is the change in the entropy of the gas. (10 points) Source: DIWA Senior High School Series: General Physics 1. DIWA LEARNING SYSTEMS INC., page 277. Solution: NOTE: Use separate sheet of paper for this activity