Given thatC+2S→CS2; ΔHf∘=+117.0kJ⋅mol−1 ....(1)C+O2→CO2; ΔHf∘=−393.0kJmol−1 .... (2)S+O2→SO2; ΔHf∘=−297.0kJmol−1 ...(3)The heat of combustion ofCS2+3O2→CO2+2SO2 is

C+2S→CS2; ΔHf∘=+117.0kJ⋅mol−1 ....(1)C+O2→CO2; ΔHf∘=−393.0kJmol−1 .... (2)S+O2→SO2; ΔHf∘=−297.0kJmol−1 ...(3)The required combustion equation is obtained as2×eqn. (3)2S+2O2→2SO22×(−297.0)kJ+ eqn. (2)C+O2→CO2+(−393.0)kJ - eqn.(1)−C−2S→−CS2−(+117.0)kJor2S+3O2−2S→2SO2+CO2−CS2 or CS2+3O2→CO2+2SO2−1104kJmol−1

Given thatC+2S→CS2; ΔHf∘=+117.0kJ⋅mol−1 ....(1)C+O2→CO2; ΔHf∘=−393.0kJmol−1 .... (2)S+O2→SO2; ΔHf∘=−297.0kJmol−1 ...(3)The heat of combustion ofCS2+3O2→CO2+2SO2 is

C+2S→CS2; ΔHf∘=+117.0kJ⋅mol−1 ....(1)C+O2→CO2; ΔHf∘=−393.0kJmol−1 .... (2)S+O2→SO2; ΔHf∘=−297.0kJmol−1 ...(3)The required combustion equation is obtained as2×eqn. (3)2S+2O2→2SO22×(−297.0)kJ+ eqn. (2)C+O2→CO2+(−393.0)kJ - eqn.(1)−C−2S→−CS2−(+117.0)kJor2S+3O2−2S→2SO2+CO2−CS2 or CS2+3O2→CO2+2SO2−1104kJmol−1

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Given that
$\begin{aligned} C + 2 S \to {CS}_{2}; Δ H_{f}^{\circ} = + 117.0 kJ \cdot {mol}^{- 1} . . . . (1) \\ C + O_{2} \to {CO}_{2}; Δ H_{f}^{\circ} = - 393.0 kJ {mol}^{- 1} . . . . (2) \\ S + O_{2} \to {SO}_{2}; Δ H_{f}^{\circ} = - 297.0 kJ {mol}^{- 1} . . . (3) \end{aligned}$
The heat of combustion of
${CS}_{2} + 3 O_{2} \to {CO}_{2} + 2 {SO}_{2} is$

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$- 807 kJ {mol}^{- 1}$

$- 1104 kJ {mol}^{- 1}$

$807 kJ {mol}^{- 1}$

$1104 kJ {mol}^{- 1}$

answer is B.

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Detailed Solution

$\begin{array}{r} C + 2 S \to {CS}_{2}; Δ H_{f}^{\circ} = + 117.0 kJ \cdot {mol}^{- 1} . . . . (1) \\ C + O_{2} \to {CO}_{2}; Δ H_{f}^{\circ} = - 393.0 {kJmol}^{- 1} . . . . (2) \\ S + O_{2} \to {SO}_{2}; Δ H_{f}^{\circ} = - 297.0 {kJmol}^{- 1} . . . (3) \end{array}$

The required combustion equation is obtained as

$2 \times$ eqn. (3)

$\begin{array}{l} 2 S + 2 O_{2} \to 2 {SO}_{2} 2 \times (- 297.0) kJ \\ + eqn. (2) \\ C + O_{2} \to {CO}_{2} + (- 393.0) kJ \\ - eqn . (1) \\ - C - 2 S \to - {CS}_{2} - (+ 117.0) kJ \end{array}$

$\begin{array}{l} 2 S + 3 O_{2} - 2 S \to 2 {SO}_{2} + {CO}_{2} - {CS}_{2} \\ or {CS}_{2} + 3 O_{2} \to {CO}_{2} + 2 {SO}_{2} (- 1104 kJ {mol}^{- 1}) \end{array}$