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.

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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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Problem Details

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.

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