The reaction of SO₂ to form SO₃ at standard condition is spontaneous at 500°C.
The equation for the formation of sulfur trioxide from sulfur dioxide is as follows:
2SO₂ + O₂ --- 2SO₃
The standard free energy change (∆Gº) of a chemical reaction is defined as the amount of energy which is released in the conversion of reactants into products under standard conditions.
By using the above equation we will determine the change in the standard free-energy. ∆G°
∆G° = ∆G°(product) - ∆G°(reactant)
Thus, the standard free-energy change is -142kJ. The value ∆G° is negative, so the process will be spontaneous.
As we know that, ∆G° become more negative as we increase the temperature. So, the reaction is spontaneous at 500°C.
Thus, we concluded that the reaction of SO₂ to form SO₃ at standard condition is spontaneous at 500°C.
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