At 298 K the combustion of liquid benzene is described by C₆H₆(l) + 7.5 O₂(g) → 6…

CHEMISTRY · Single correct · A Level · Chemistry · Thermodynamics · Thermodynamics

Problem

At 298 K the combustion of liquid benzene is described by C₆H₆(l) + 7.5 O₂(g) → 6 CO₂(g) + 3 H₂O(l) ΔS° = +250 J·mol⁻¹·K⁻¹. Determine ΔS° (in kJ·mol⁻¹·K⁻¹) for the reaction written below, in which all stoichiometric coefficients have been divided by three and the direction has been reversed. 2 CO₂(g) + H₂O(l) → ⅓ C₆H₆(l) + 2.5 O₂(g) (a) +0.083 kJ mol−1 K−1+0.083\ \text{kJ\,mol}^{-1}\,\text{K}^{-1} (b) −0.250 kJ mol−1 K−1-0.250\ \text{kJ\,mol}^{-1}\,\text{K}^{-1} (c) −0.083 kJ mol−1 K−1-0.083\ \text{kJ\,mol}^{-1}\,\text{K}^{-1} (d) −0.833 kJ mol−1 K−1-0.833\ \text{kJ\,mol}^{-1}\,\text{K}^{-1}

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