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The chemical reaction that causes chromium to corrode in air is given by 4Cr+3O2→2Cr2O3 in which at 298 K ΔH∘r...

The chemical reaction that causes chromium to corrode in air is given by

4Cr+3O2→2Cr2O3

in which at 298 K

ΔH∘rxn = −2256 kJ
ΔS∘rxn = −549.1 J/K

Part A

What is the standard Gibbs free energy for this reaction? Assume the commonly used standard reference temperature of 298 K.

Express your answer as an integer and include the appropriate units.

Part B

What is the Gibbs free energy for this reaction at 4717 K ? Assume that ΔH and ΔS do not change with temperature.

Part C

At what temperature Teq do the forward and reverse corrosion reactions occur in equilibrium?

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Answer #1

Part A -256-298בx C-541.1 Χ/03) - paYts -2256-4HFX (-549 . Ixlo3 Part c 225 6

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