Chlorofluorocarbons (CFCS) are no longer used as refrigerants because they catalyze the decomposition of stratospheric ozone. Trichlorofluoromethane (CCI3F) boils at 23.8°C, andi condensation of CCI3F()? molar heat of vaporization is 24.8 kJ/mol. What is the molar entropy of J/mol K

If a reaction does not move forward and backward (meaning only move to one direction; could be product favored, could be reactant favored under these conditions), what is true about entropy and enthalpy?     a. ΔH°rxn < 0 and ΔS°rxn > 0.   b. ΔH°rxn < 0 and ΔS°rxn < 0.   c. ΔH°rxn > 0 and ΔS°rxn < 0.   d. ΔH°rxn > 0 and ΔS°rxn > 0.   e. both a and c are correct

What is the entropy when 1.26 moles of CCl₂F₂ vaporize at 25°C? [∆H(vap) = 17.2 kJ/mol at 25°C]

What is the entropy change when 1.20 moles of CCl₂F₂ condenses at 25.0 °C? [∆H(vap) = 17.2 kJ/mol at 25.0 °C]?

Given the following reaction: 2NO(g) + Cl2(g) 2NOCl(g) DHorxn = -75.5kJ 1. Is the reaction exothermic or endothermic? 2.Does the entropy increase, decrease, or stay the same as reactants form products? 3.Calculate the DGorxn at 10oC and indicate whether the reaction is spontaneous or nonspontaneous. SfoNO = 210.65 J/K; SfoCl2 = 223 J/K; SfoNOCl = 261.6 J/K

What is the entropy change when 1.90 moles of CHCl3 condenses at 61.0 °C? [AH(vap) = 29.6 kJ/ mol at 61.0 °C]

The formation reaction for carbon dioxide at 298 K is: C(s) + O₂(g) → CO₂(g) AƒH° = −393.51 kJ/mol Determine A, Hº at 1000 Kelvin given the following data: Cp values: carbon is 8.53 J/Kmol; oxygen gas is 29.36 J/Kmol; carbon dioxide gas is 37.11 J/Kmol.

A reaction has AH = -112 kJ and ASan = 354 J/K. At what temperature is the change in entropy for the reaction equal to the change in entropy for the surroundings?

A certain hydrocarbon of the molecular formula CxH2x has a standard enthalpy of formation ∆Hf° = –115.0 kJ/mol and a standard enthalpy of combustion ∆H°combust = –3281.5 kJ/mol. What is x? Use the following data: ∆Hf°[CO2(g)] = –393.5 kJ/mol, ∆Hf°[H2O(l)] = –285.8 kJ/mol.   A.  x = 7   B.  x = 4   C.  x = 5   D.  x = 6   E.  x = 8

. Chloroform, CHC13, has a normal boiling point of 61 °C and it enthalpy of vaporization is 29.24 kJ/mol, what is its entropy of vaporization in J/mol·K at 61 °C? Before you calculate it write a chemical equation for this process and predict do you expect entropy to be positive or negative?