$\begin{aligned}
& \mathrm{S}(\mathrm{g})+\frac{3}{2} \mathrm{O}_2(\mathrm{g}) \rightarrow \mathrm{SO}_3(\mathrm{g})+2 x \mathrm{kcal} \
& \mathrm{SO}_2(\mathrm{g})+\frac{1}{2} \mathrm{O}_2(\mathrm{g}) \rightarrow \mathrm{SO}_3(\mathrm{g})+y \mathrm{kcal}
\end{aligned}Theheatofformationof\mathrm{SO}_2(\mathrm{~g})$ is given by :
Held on 24 Jan 2025 · Verified 6 Jul 2026.
x+ykcal
y−2xkcal
y2xkcal
2x+ykcal
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