THIS IS ONE QUESTION, 3 PARTS!! EXACTLY HOW IT IS ASKED. The chemical reaction t
ID: 936413 • Letter: T
Question
THIS IS ONE QUESTION, 3 PARTS!! EXACTLY HOW IT IS ASKED.
The chemical reaction that causes chromium to corrode in air is given by
4Cr+3O2?2Cr2O3
in which at 298 K
A)What is the standard Gibbs free energy for this reaction? Assume the commonly used standard reference temperature of 298 K. Include units ?G?rxn=?
b)What is the Gibbs free energy for this reaction at 4717K ? Assume that ?H and ?S do not change with temperature.?Grxn =?
c)At what temperature Teq do the forward and reverse corrosion reactions occur in equilibrium? Teq=?
?H?rxn = ?2256 kJ ?S?rxn = ?549.1 J/KExplanation / Answer
A) DG0= DH0 -TDS0---> DG0=-2256KJ - 298K x -0.5491KJ/K= -2092.4 KJ
B) DG= DH -TDS---> DG=-2256KJ - 4717K x -0.5491KJ/K= 334.1KJ
In this case we use DH0 and DS0 as DH and DS because the question says that they don
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