$ \boldsymbol{S}+\frac{\mathbf{3}}{\mathbf{2}} \boldsymbol{O}_{2} \rightarrow \boldsymbol{S} \boldsymbol{O}_{3}+\mathbf{2} \boldsymbol{x} $ kcal $ \boldsymbol{S O}_{2}+\frac{1}{2} \boldsymbol{O}_{2} \rightarrow \boldsymbol{S} \boldsymbol{O}_{3}+\boldsymbol{y} $ kcal The heat of formati

Question

$ \boldsymbol{S}+\frac{\mathbf{3}}{\mathbf{2}} \boldsymbol{O}_{2} \rightarrow \boldsymbol{S} \boldsymbol{O}_{3}+\mathbf{2} \boldsymbol{x} $ kcal $ \boldsymbol{S O}_{2}+\frac{1}{2} \boldsymbol{O}_{2} \rightarrow \boldsymbol{S} \boldsymbol{O}_{3}+\boldsymbol{y} $ kcal The heat of formation of $ S O_{2} $ is:

Accepted Answer

$ y-2 x $. The heat of formation of SO2 is the enthalpy change for S + O2 → SO2. By reversing the first equation and adding it to the second, SO3 cancels and the net reaction becomes S + O2 → SO2. The corresponding heat change is y - 2x.

Solution

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