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From the given reactions,
\[
\begin{array}{l}
\mathrm{S}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{SO}_{3}(\mathrm{~g})+2 \mathrm{xkcal} \\
\mathrm{SO}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{SO}_{3}(\mathrm{~g})+\mathrm{ykcal}
\end{array}
\]
The heat of formation of \( \mathrm{SO}_{2} \) is
(a) \( (x+y) \)
(b) \( (x-y) \)
(c) \( (2 x+y) \)
(d) \( (2 x-y) \)
\( \mathrm{P} \)
W
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