S(s)+32O2(g)→SO3(g)+2x kcalSO2(g)+12O2(g)→SO3(g)+y kcalCalculate heat of formation of SO2(g)

S+O2→SO2;ΔHf=? .....(3)ΔHf=ΔH1−ΔH2=−2x−(−y)=y−2x

S(s)+32O2(g)→SO3(g)+2x kcalSO2(g)+12O2(g)→SO3(g)+y kcalCalculate heat of formation of SO2(g)

S+O2→SO2;ΔHf=? .....(3)ΔHf=ΔH1−ΔH2=−2x−(−y)=y−2x

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$S_{(s)} + \frac{3}{2} O_{2 (g)} \to S O_{3_{(g)}} + 2 x k c a l$
$S O_{2_{(g)}} + \frac{1}{2} O_{2 (g)} \to S {O_{3}}_{(g)} + y k c a l$
Calculate heat of formation of $S {O_{2}}_{(g)}$

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$2 x + y$

$2 x - y$

$y - 2 x$

$x + y$

answer is A.

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$S + O_{2} \to S O_{2}; Δ H_{f} = ? ..... (3)$

$Δ H_{f} = Δ H_{1} - Δ H_{2} = - 2 x - (- y) = y - 2 x$

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S(s)+32O2(g)→SO3(g)+2x kcalSO2(g)+12O2(g)→SO3(g)+y kcalCalculate heat of formation of SO2(g)

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$S_{(s)} + \frac{3}{2} O_{2 (g)} \to S O_{3_{(g)}} + 2 x k c a l$
$S O_{2_{(g)}} + \frac{1}{2} O_{2 (g)} \to S {O_{3}}_{(g)} + y k c a l$
Calculate heat of formation of $S {O_{2}}_{(g)}$