4I.3

[Miguel Hernandez LEC 3]

What is the standard entropy change of the surroundings when 10. g of benzene, C6H6, vaporizes at its boiling point.

I understand how to solve this problem by multiplying the standard entropy by the amount of moles of benzene however, I have having trouble visualizing why the answer would be negative. I had understood that - entropy means that the surrounding has more order, I do not get how the vaporization of benzene would lead to a decrease in disorder. Thanks!

[Drake Snyder 1F]

Not exactly sure here but I'll try my best to help you! Because benzene is going from a gas to a liquid, it is gaining entropy, hence why the answer to question A is positive. However, because the surroundings are becoming more ordered relative to the disorderly C6H6(g) (the system), it will display a negative value for the change in entropy.