We’re being asked to determine the **ΔS°** for the given reaction:

H_{2}S(g)+2O_{2}(g)→H_{2}O(g)+SO_{3}(g)

We can use the following equation to solve for ** ΔS˚_{rxn}**:

$\overline{){\mathbf{\Delta S}}{{\mathbf{\xb0}}}_{{\mathbf{rxn}}}{\mathbf{=}}{\mathbf{\Delta S}}{{\mathbf{\xb0}}}_{\mathbf{,}\mathbf{}\mathbf{prod}}{\mathbf{-}}{\mathbf{\Delta S}}{{\mathbf{\xb0}}}_{\mathbf{,}\mathbf{}\mathbf{react}}}$

Note that we need to *multiply each ΔS˚ _{f} by the stoichiometric coefficient* since ΔS˚

Part B. Calculate Δ*S*°rxn for the balanced chemical equation: H_{2}S(g)+2O_{2}(g)→H_{2}O(g)+SO_{3}(g)

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