$S(g)+\frac{3}{2}{O}_{2}(g)\to S{O}_{3}(g)+2xkcal\ S{O}_{2}(g)+\frac{1}{2}{O}_{2}(g)\to S{O}_{3}(g)+ykcal$ The heat of formation of $S{O}_{2}(g)$ is given by

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\(S(g)+\frac{3}{2}{O}_{2}(g)\to S{O}_{3}(g)+2xkcal\\ S{O}_{2}(g)+\frac{1}{2}{O}_{2}(g)\to S{O}_{3}(g)+ykcal\) The heat o…

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