2. If an endorthermic reaction is spontaneous at 298 K, which of the following must be true for the reaction?
DG is greater than zero DG is greater than zero DG and DH are greater than zero DH and DS are greater than zero DG, DH, DS are all greater than zero
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. 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 DSsurroundings.
0 69.0 kJ/mol 71.9 J/K mol 61.0 kJ/mol -71.9 J/K mol
5. For the gas sample B, this reaction is endothermic: B-->2B. The reaction is:
always spontaneous only at high temperatures only at low temperatures never spontaneous none of the above
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