2. Choose the CORRECT statement:
Exothermic reactions are always spontaneous Free energy is independent of temperature. A reaction which exhibits a negative value of D S cannot be spontaneous. At constant P and T, a decrease in free energy insures an increase in the entropy of the system. None of the above statements are true.
3. The maximum possible useful work obtainable from a process at a constant temperature and pressure is equal to the change in:
temperature DH DS free energy work
4. A system can achieve the lowest possible free energy by going into:
high pressure presence of catalyst equilibrium completion none of the above
5. Rubidium has a heat of vaporization of 69.0 kJ/mol at its boiling point (686oC). For the process Rb(l)-->Rb(g) at 1 atm and 686oC. Calculate the value of DS.
0 69.0 kJ/mol 71.9 J/K mol 61.0 kJ/mol -7.97 kJ/mol
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