LEC 26 CHAP 19 - Lecture 26 Free Energy Change and...

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TOUPADAKIS Lecture 26 Chapter 19 Lecture 26 Free Energy Change and Spontaneity Spontaneity of a Chemical Change at Nonstandard Conditions: Δ G = Δ G° + RT ln Q Relationship of Δ G° to the Equilibrium Constant: Δ G° = - RT ln K eq
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TOUPADAKIS Lecture 26 Chapter 19 Free Energy Change and Spontaneity Whether a physical change (like vaporization of water) is spontaneous or not (in other words it has the tendency to take place or not), it depends on the temperature , and pressure . In the case of a chemical change, besides temperature , and pressure it also depends on the composition of the reaction mixture. If a reaction is spontaneous (i.e. has the tendency to form products) under certain conditions, it does not necessarily mean that it will also have the tendency to form products under some other conditions. Study the following examples.
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TOUPADAKIS Lecture 26 Chapter 19 Spontaneity Depends on Pressure At 25 o C the vapor pressure of water is P H 2 O = 0.03 atm If P ext = 0.01 atm, the process:
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LEC 26 CHAP 19 - Lecture 26 Free Energy Change and...

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