University College - Chemistry Chem 112A Lecture Notes - Lecture 23: Gibbs Free Energy
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13 Dec 2016
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Related Questions
A process at constant T and P can be described as spontaneous if ÎG < 0 and nonspontaneous if ÎG > 0. Over what range of temperatures is the following process spontaneous? Assume that gases are at a pressure of 1 atm. (Hint: Use the data below to calculate ÎH and ÎS [assumed independent of temperature and equal to ÎH° and ÎS°, respectively] and then use the definition of ÎG.)
2 SO3(g) | â | 2 SO2(g) | + | O2(g) | |
ÎHf° (kJ mol-1) | -395.7 | -296.8 | |||
S° (J K-1 mol-1) | 256.8 | 248.2 | 205.1 |
ÎH° = kJ
ÎS° = J K-1
The calculated value of T at which ÎG° = 0 is K.
Reaction is spontaneous _________above this temperaturebelow this temperatureat all temperaturesat no temperature.