Exhibit 17-1 Consider the reaction of carbon monoxide and chlorine gas to form phosgene as shown below to answer the following question(s) . CO (g) + Cl₂ (g) →ClC(O) Cl (g)
-Refer to Exhibit 17-1. What is the standard change in entropy, D S ° _rxn, at 298 K for this reaction given that D G ° _rxn = - 206 kJ/mol and D H ° _rxn = - 220 kJ/mol?

Question

Quizplus · Accepted Answer

The standard change in entropy ($ \Delta S^\circ_{rxn} $) can be calculated using the Gibbs free energy equation $ \Delta G^\circ_{rxn} = \Delta H^\circ_{rxn} - T\Delta S^\circ_{rxn} $. Rearranging for $ \Delta S^\circ_{rxn} $ gives $ \Delta S^\circ_{rxn} = (\Delta H^\circ_{rxn} - \Delta G^\circ_{rxn}) / T $. Substituting $ \Delta H^\circ_{rxn} = -220 \,kJ/mol $, $ \Delta G^\circ_{rxn} = -206 \,kJ/mol $, and $ T = 298 \,K $ yields $ \Delta S^\circ_{rxn} = (-220 + 206) \,kJ/mol / 298 \,K = -14 \,kJ/mol / 298 \,K = -0.047 \,kJ/mol\cdot K = -47 \,J/mol\cdot K $.

Exhibit 17-1 Consider the Reaction of Carbon Monoxide and Chlorine