QuestionApril 17, 2026

CS_(2)(l)+2H_(2)O(l)arrow CO_(2)(g)+2H_(2)S(g) Delta H^circ _(rxn)=? Which of the following combinations represents the individual reactions and the quantities needed to determine Delta H' for the overall reaction represented by the chemical equation above? A CS_(2)(l)+3O_(2)(g)arrow CO_(2)(g)+2SO_(2)(g) Delta H^+=-1075kJ 2H_(2)O(l)+2SO_(2)(g)arrow 2H_(2)S(g)+3O_(2)(g) Delta H^+=+1136kJ B CS_(2)(l)+3O_(2)(g)arrow CO_(2)(g)+2SO_(2)(g) H_(2)O(l)+SO_(2)(g)arrow H_(2)S(g)+(3)/(2)O_(2)(g) Delta H^+=-1075kJ Delta H^+=+568kJ (C) CS_(2)(l)+3O_(2)(g)arrow CO_(2)(g)+2SO_(2)(g) Delta H^+=-1075kJ Delta H^+=-568kJ

CS_(2)(l)+2H_(2)O(l)arrow CO_(2)(g)+2H_(2)S(g) Delta H^circ _(rxn)=? Which of the following combinations represents the individual reactions and the quantities needed to determine Delta H' for the overall reaction represented by the chemical equation above? A CS_(2)(l)+3O_(2)(g)arrow CO_(2)(g)+2SO_(2)(g) Delta H^+=-1075kJ 2H_(2)O(l)+2SO_(2)(g)arrow 2H_(2)S(g)+3O_(2)(g) Delta H^+=+1136kJ B CS_(2)(l)+3O_(2)(g)arrow CO_(2)(g)+2SO_(2)(g) H_(2)O(l)+SO_(2)(g)arrow H_(2)S(g)+(3)/(2)O_(2)(g) Delta H^+=-1075kJ Delta H^+=+568kJ (C) CS_(2)(l)+3O_(2)(g)arrow CO_(2)(g)+2SO_(2)(g) Delta H^+=-1075kJ Delta H^+=-568kJ
CS_(2)(l)+2H_(2)O(l)arrow CO_(2)(g)+2H_(2)S(g) Delta H^circ _(rxn)=? Which of the following combinations represents the individual reactions and the quantities needed to determine Delta H' for the overall reaction represented by the chemical equation above? A CS_(2)(l)+3O_(2)(g)arrow CO_(2)(g)+2SO_(2)(g) Delta H^+=-1075kJ 2H_(2)O(l)+2SO_(2)(g)arrow 2H_(2)S(g)+3O_(2)(g) Delta H^+=+1136kJ B CS_(2)(l)+3O_(2)(g)arrow CO_(2)(g)+2SO_(2)(g) H_(2)O(l)+SO_(2)(g)arrow H_(2)S(g)+(3)/(2)O_(2)(g) Delta H^+=-1075kJ Delta H^+=+568kJ (C) CS_(2)(l)+3O_(2)(g)arrow CO_(2)(g)+2SO_(2)(g) Delta H^+=-1075kJ Delta H^+=-568kJ

Solution
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Answer

A Explanation 1. Identify target reaction Target: CS_{2}(l) + 2H_{2}O(l) \rightarrow CO_{2}(g) + 2H_{2}S(g). This can be obtained by combining CS_{2} oxidation to CO_{2} and SO_{2} and then converting SO_{2} + H_{2}O to H_{2}S. 2. Match oxidation reaction First needed: CS_{2}(l) + 3O_{2}(g) \rightarrow CO_{2}(g) + 2SO_{2}(g) with \Delta H = -1075\ \text{kJ} (present in all options). 3. Match SO_{2} conversion reaction Need: 2H_{2}O(l) + 2SO_{2}(g) \rightarrow 2H_{2}S(g) + 3O_{2}(g). In option A, this reaction is exactly present with \Delta H = +1136\ \text{kJ} — correctly scaled for 2 SO_{2}. Option B has it scaled per 1 SO_{2} (+568 kJ), so requires doubling for 2 SO_{2}. Option C wrongly signs the second reaction. 4. Combine reactions Option A directly matches stoichiometry. Adding ΔH: (-1075) + (+1136) = +61\ \text{kJ}.

Explanation

1. Identify target reaction <br /> Target: $CS_{2}(l) + 2H_{2}O(l) \rightarrow CO_{2}(g) + 2H_{2}S(g)$. <br />This can be obtained by combining $CS_{2}$ oxidation to $CO_{2}$ and $SO_{2}$ and then converting $SO_{2}$ + $H_{2}O$ to $H_{2}S$. <br /><br />2. Match oxidation reaction <br /> First needed: $CS_{2}(l) + 3O_{2}(g) \rightarrow CO_{2}(g) + 2SO_{2}(g)$ with $\Delta H = -1075\ \text{kJ}$ (present in all options). <br /><br />3. Match $SO_{2}$ conversion reaction <br /> Need: $2H_{2}O(l) + 2SO_{2}(g) \rightarrow 2H_{2}S(g) + 3O_{2}(g)$. <br />In option A, this reaction is exactly present with $\Delta H = +1136\ \text{kJ}$ — correctly scaled for 2 $SO_{2}$. <br />Option B has it scaled per 1 $SO_{2}$ (+568 kJ), so requires doubling for 2 $SO_{2}$. <br />Option C wrongly signs the second reaction. <br /><br />4. Combine reactions <br /> Option A directly matches stoichiometry. <br />Adding ΔH: $(-1075) + (+1136) = +61\ \text{kJ}$.
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