Given S(s) + O₂(g) → SO₂(g), Δ H = -296.8 kJ, and…

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Given $\text{S(s)} + \text{O}_2\text{(g)} \rightarrow \text{SO}_2\text{(g)}$ , $\Delta H = -296.8\ \text{kJ}$ , and $2\text{SO}_2\text{(g)} + \text{O}_2\text{(g)} \rightarrow 2\text{SO}_3\text{(g)}$ , $\Delta H = -197.8\ \text{kJ}$ . What is $\Delta_f H$ of $\text{SO}_3\text{(g)}$ ?

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