\(\mathrm{S}(\mathrm{~g})+\frac{3}{2} \mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{SO}_{3}(\mathrm{~g})+2 \mathrm{x} \ \mathrm{kcal}\)
\(\mathrm{SO}_{2}(\mathrm{~g})+\frac{1}{2} \mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{SO}_{3}(\mathrm{~g})+\mathrm{y} \ \mathrm{kcal}\)
The heat of formation of SO2(g) is given by :
1
\(\rm \frac{2 x}{y}\) kcal
2
y – 2x kcal
3
2x + y kcal
4
x + y kcal