The chemical reaction that causes magnesium to corrode in air is given by 2Mg+O2

Question

The chemical reaction that causes magnesium to corrode in air is given by 2Mg+O22MgO in which at 298 K Hrxn = 1204 kJ Srxn = 217.1 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. Grxn = 6K

Part B What is the Gibbs free energy for this reaction at 5958 K ? Assume that H and S do not change with temperature. Express your answer to two decimal places and include the appropriate units. Grxn =

Part C At what temperature Teq do the forward and reverse corrosion reactions occur in equilibrium? Express your answer as an integer and include the appropriate units. Teq =

Explanation / Answer

Part (A) :

?G?rxn = ?H?rxn - T ?S?rxn

?G?rxn = -1204 - (298 x -0.217)

?G?rxn = -1139.3 kJ

Part(B) :

?G?rxn = ?H?rxn - T ?S?rxn

?G?rxn = -1204 - (5958 x -0.217)

?G?rxn = 88.89 kJ

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