Determining the Change in Entropy of the Surroundings without Being Given the Reversibility

[Cole Woulbroun 1J]

In the homework problem 4I.3, the chanfe in the entropy of the surroundings is asked for, however it does not specify whether the process was reversible or irreversible. Will this information be specified if asked for on the final?

[ShravanPatel2B]

I usually assume that the reaction is irreversible unless stated that it is reversible in the problem.

[Frank He 4G]

For this problem, it seems like we don't have to know the reversibility. I solved it correctly myself under the assumption that the Ssur simply equals the standard entropy of vaporization of the substance (which is given) adjusted for the amount of the substance. So I suppose the underlying assumption here is that standard entropy of vaporizations are equal to the Ssur of vaporization, at standard conditions.