Figure P19.46 shows a device consisting of two units, A and B. Each unit has a volume \(V\), and at one end a partition separates off a small compartment that has volume \(V / 3\), as shown in part \(a\). Initially, unit \(A\) has \(3 \mathrm{~mol}\) of a gas in its smaller compartment, and unit B has \(2 \mathrm{~mol}\) of the same gas in its smaller compartment. When the partitions are removed and the gas in each unit is allowed to expand into the volume \(V\) as shown in part \(b\), what is the change in the entropy of the two-unit system?

Data from P19.46

Transcribed Image Text:

(a) 3 mol V/3 A (b) A V V/3 V B B 2 mol