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16 Nov 2019
Calculate for S^0 for O_3(g) if the standard entropy change for the reaction below is 274 J/K. mol-rxn and S^0 [O_2(g)] = 205 J/K middot mol. 4O_3(g) rightarrow 6O_2 (g) a. 364 J/K middot mol-rxn b. 478 J/K middot mol- rxn c. 239 J/K middot mol-nxn d. -117 J/K middot mol-rxn e. -59 J/K middot mol-nxn What is the sign of Delta H (system) and Delta S (system if a chemical reaction is spontaneous at all temperatures under standard conditions? a. Delta H (system) is negative, and Delta S (system) is positive. b. Delta H (system) is negative, and Delta S (system) is negative. c. Delta H (system) is positive, and Delta S (system) is positive. d. Delta H (system) is positive, and Delta S (system) is negative. e, none of these For which of the following reactions will the entropy of the system decrease? a. 2 NH_3(g) rightarrow N_2(g) + 3 H_2(g) b. 2 C(s) + O_2(g) rightarrow 2 CO(g) c. CaCO_3(s) rightarrow CaO(s) + CO_2(g) d. 2 NO_2(g) rightarrow N_2O_4(g) e. NaOH(s) rightarrow Na^+ (aq) + OH^-(aq) All of the following relationships are true EXCEPT a. Delta G degree_sys = Delta H degree_sys - T Delta S degree_sys. b. Delta G degree_sys = - RT ln(k). c. Delta S degree_univ = Delta S degree_sys + Delta S degree_surr. d. Delta H = Delta H degree_sys + RT ln(k). e. Delta G degree_sys = - T Delta S degree_univ.
Calculate for S^0 for O_3(g) if the standard entropy change for the reaction below is 274 J/K. mol-rxn and S^0 [O_2(g)] = 205 J/K middot mol. 4O_3(g) rightarrow 6O_2 (g) a. 364 J/K middot mol-rxn b. 478 J/K middot mol- rxn c. 239 J/K middot mol-nxn d. -117 J/K middot mol-rxn e. -59 J/K middot mol-nxn What is the sign of Delta H (system) and Delta S (system if a chemical reaction is spontaneous at all temperatures under standard conditions? a. Delta H (system) is negative, and Delta S (system) is positive. b. Delta H (system) is negative, and Delta S (system) is negative. c. Delta H (system) is positive, and Delta S (system) is positive. d. Delta H (system) is positive, and Delta S (system) is negative. e, none of these For which of the following reactions will the entropy of the system decrease? a. 2 NH_3(g) rightarrow N_2(g) + 3 H_2(g) b. 2 C(s) + O_2(g) rightarrow 2 CO(g) c. CaCO_3(s) rightarrow CaO(s) + CO_2(g) d. 2 NO_2(g) rightarrow N_2O_4(g) e. NaOH(s) rightarrow Na^+ (aq) + OH^-(aq) All of the following relationships are true EXCEPT a. Delta G degree_sys = Delta H degree_sys - T Delta S degree_sys. b. Delta G degree_sys = - RT ln(k). c. Delta S degree_univ = Delta S degree_sys + Delta S degree_surr. d. Delta H = Delta H degree_sys + RT ln(k). e. Delta G degree_sys = - T Delta S degree_univ.
Elin HesselLv2
9 Mar 2019