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Calculation of decomposition temperature of Ag2O

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I do not understand how to calculate this.

For the following reaction:
Ag2O (s) > Ag (s) + ½O2 (g)
H°f (kJ / K . mole) -31 0 0
S° (J / K . mole) 121.3 42.6 205.1
Calculate the temperature (°C) where Kp = 1.

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Solution Summary

The formation of Ag2O from elements is determined. The Gibbs free energy is calculated.

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Thermodynamics
Your problem is
I do not understand how to calculate this.

For the following reaction:
Ag2O (s) → Ag (s) + ½O2 (g)
H°f (kJ / K . mole) -31 0 0
S° (J / K . mole) 121.3 42.6 205.1
Calculate the temperature (°C) where Kp = 1.
Solution:
Let us first look at the formation of Ag2O from its elements:

2Ag(s) + ...

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