A set of mixing processes is shown in the following fi gures. The volumes are represented by the size of the boxes. For each process, determine whether Ds is greater than zero, less than zero, or equal to zero. Explain your answer. You may assume O2 and N2 behave as ideal gases.
Refl ect on your results in parts (a) through (d), and comment on the common statement that entropy represents the “degree of disorder” in a system.

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N N N N N 13 N N N N N N N N2 0 0 N 0 02 02 N N N 02 N N N N Mixing process (a) Mixing process (b) N N N 0 N N 3 N N N 02 N 8 N N N N 02 0 N N N 02 N N N 0 N N N