Which one of the following processes produces a decrease of the entropy of the s

Question

Which one of the following processes produces a decrease of the entropy of the system dissolving sodium chloride in water sublimation of naphthalene explosion of nitroglycerine dissolving oxygen in water boiling of alcohol Given the following table of thermodynamic data, complete the following sentence. The vaporization of PCI_3 (1) is._spontaneous at low temperature and nonspontaneous at high temperature nonspontaneous at all temperatures nonspontaneous at low temperature and spontaneous at high temperature spontaneous at all temperatures not enough information given to draw a conclusion

Explanation / Answer

1) Option D

Dissolving Oxygen gas in water reduces its entropy as it is more chaos in gaseous state.

2) The thermodynamic table given is irrelevant to the question mentioned below.

Taking up values for PCL3(g) and PCL3(l)

G = H -TS.
PCl3(g): G = -288.07-0.3117*T (kJ/mol)
PCl3 (l): G = -319.6-0.217*T (kJ/mol)
G(liquid --> gas) = 31.5-0.095*T (kJ/mol)
Set G(liquid --> gas) = 0, we would have: T = 31.5/0.095=332(K).
Hence the correct answer is:
a) nonspontaneous at low temperature and spontaneous at high temperature.

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