The standard free energy of formation of KCl(s)is -408.8 kJ/mol.$\Delta$G° for the reaction 2KCl(s)$\to$ 2K(s)+ Cl₂(g)is:

Name: The standard free energy of formation of KCl(s)is -408.8 kJ/mol.$\Delta$G° for the reaction 2KCl(s)$\to$ 2K(s)+ Cl 2 (g)is:
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The standard free energy change for the reaction is the reverse of the formation of KCl(s), so it is 2 times the positive of the formation energy: 2 x 408.8 kJ/mol = 817.6 kJ.

The Standard Free Energy of Formation of KCl(s)is -408 Δ\DeltaΔ G° for the Reaction 2KCl(s)

The Standard Free Energy of Formation of KCl(s)is -408 $\Delta$ G° for the Reaction 2KCl(s)