Chemistry Gibbs Free Energy Solution: Consider the oxidation of SO2 to SO3: SO2 (g) + 1/...

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Solution: Consider the oxidation of SO2 to SO3: SO2 (g) + 1/2 O2 (g) → SO3 (g) Calculate ΔGºrxn at 25 C. Express your answer to one decimal place with the appropriate units. Determine whether the reaction is spontaneous at standard conditions.

Problem

Consider the oxidation of SO2 to SO3

SO2 (g) + 1/2 O2 (g) → SO3 (g) 

Calculate ΔGºrxn at 25 C. 

Express your answer to one decimal place with the appropriate units. 






Determine whether the reaction is spontaneous at standard conditions.

Solution

The standard free energy change of a reaction (ΔG˚rxn) is given by the following equation:



The balanced equation for the oxidation of SO2 is:

SO2(g) + 1/2 O2(g)  SO3(g)


We’re given the ΔH˚f and S˚ of each reactant and product. We can use those to calculate for ΔH˚rxn and ΔS˚rxn separately.



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