2. Choose the correct statement.
Exothermic reactions are always spontaneous High temperature ensures a spontaneous reaction Free energy is independent of temperature A reaction with negative DS cannot be spontaneous none of the above
3. Which statement is FALSE?
DS increases as pressure decreases for an ideal gas, enthalpy is not pressure-dependent the lowest value of free energy occurs at equilibrium DS increases as volume increases all statements are true
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 DSuniverse.
0 69.0 kJ/mol 71.9 J/K mol 61.0 kJ/mol -7.97 kJ/mol
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