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Part c) Calculate the change in Gibbs free energy for vaporization of 20 grams of Hg...

Part c) Calculate the change in Gibbs free energy for vaporization of 20 grams of Hg at 340 oC (assume the entropy is the same as it was at 357 oC).  


Explain the significance of the sign on the answer for part c

Science   Advanced-Physics   
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Answer #1

Expression for Gibbs free energy change is

For the process of vaporization, enthalpy change is positive since overall, an energy gain to the system occurs during change of state from liquid to gas. So

is positive (+ sign)

In the process of vaporizaton, the randomness of the partices is increasing, since particles in the gaseous state are more free to move. So,

is also positive (+ sign)

so, if the magnitude of , the sign of is negatve and the process is spontaneous and vice-versa.

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