2. In which case MUST a reaction be spontaneous, independent of T?
DH = 0, DS must be positive. DH = 0, DS is negative. DS = 0, DH is positive. DH is negative, DS is positive. None of these
3. Which of these statements is false?
For a spontaneous reaction DG is negative Independent of T, a reaction must be spontaneous if DH = 0 and DS is positive A spontaneous reaction is always fast A spontaneous reaction occurs without outside intervention None of the above is false
4. 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.
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 DG.
0 69.0 kJ/mol 71.9 J/K mol 61.0 kJ/mol -7.97 kJ/mol
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