Problem: The standard free energies of formation and the standard enthalpies of formation at 298 K for difluoroacetylene (C2F2) and hexafluorobenzene (C6F6) areFor the following reaction:                C  6F6 (g) ⇌ 3C 2F2 (g)a. calculate ΔS° at 298 K.

🤓 Based on our data, we think this question is relevant for Professor Nair's class at TAMU.

FREE Expert Solution

 C6F6 (g) ⇌ 3 C2F2(g)



ΔG°rxn=ΔH°rxn-TΔS°rxn



Step 1: We can use the following equation to solve for ΔH˚rxn:


ΔH°rxn=ΔH°f, prod-ΔH°f, react


ΔH°rxn=(3 mol C2F2)241.3 kJ1 mol C2F2-(1 mol C6H6)132.8 kJ1 mol C6H6

ΔH°rxn=591.1 kJmol×103 J1 kJ

ΔH˚rxn = 591100 J/mol



Step 2: We can use the following equation to solve for ΔG˚rxn:


ΔG°rxn=G°f, prod-G°f, react


ΔG°rxn=(3 mol C2F2)191.2 kJ1 mol C2F2-(1 mol C6H6)78.2 kJ1 mol C6H6

ΔG°rxn=495.4kJmol×103 J1 kJ

ΔG˚rxn = 495400 J/mol



Step 3: Calculate for ΔS˚rxn

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Problem Details

The standard free energies of formation and the standard enthalpies of formation at 298 K for difluoroacetylene (C2F2) and hexafluorobenzene (C6F6) are


For the following reaction:
                C  6F6 (g) ⇌ 3C 2F2 (g)

a. calculate ΔS° at 298 K.

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Based on our data, we think this problem is relevant for Professor Nair's class at TAMU.

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Our data indicates that this problem or a close variation was asked in Chemistry: An Atoms First Approach - Zumdahl 2nd Edition. You can also practice Chemistry: An Atoms First Approach - Zumdahl 2nd Edition practice problems.