The chemical reaction that causes iron to corrode in air is given by 4Fe +302-+2

Question

The chemical reaction that causes iron to corrode in air is given by 4Fe +302-+2Fe2O3 in which at 298 K Ann =-1684 kJ ason =-543.7 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. Hints Gron : 1 Value Units Submit My Answers Give Up Incorrect; One attempt remaining; Try Again The units for a standard free energy of reaction are simply those of energy. Part B What is the Gibbs free energy for this reaction at 3652 K ? Assume that H and S do not change with temperature. Express your answer to two decimal places and include the appropriate units. Hints

Explanation / Answer

A)

deltaHo = -1684.0 KJ

deltaSo = -543.7 J/K

= -0.5437 KJ/K

T = 298 K

we have below equation to be used:

deltaGo = deltaHo - T*deltaSo

deltaGo = -1684.0 - 298.0 * -0.5437

deltaGo = -1522 KJ

Answer: -1522 KJ

B)

Now we have:

deltaHo = -1684.0 KJ

deltaSo = -543.7 J/K

= -0.5437 KJ/K

T = 3652 K

we have below equation to be used:

deltaGo = deltaHo - T*deltaSo

deltaGo = -1684.0 - 3652.0 * -0.5437

deltaGo = 301.59 KJ

Answer: 301.59 KJ

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