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1. 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

2. For a reaction, the DS = -30J/K and DH=25kJ. Is this reaction spontaneous at STP?
no
yes
need more info
only at high pressures
only at low pressures

3. The melting point of water is 0oC at 1 atm pressure because under these conditions:
DS for the process H2O(s)--> H2O(l) is positive.
DS and DSsurr for the process H2O(s)--> H2O(l) are both positive.
DS and DSsurr for the process H2O(s)--> H2O(l) are equal in magnitude and opposite in sign.
DG is positive for the process H2O(s)--> H2O(l).
None of these is correct.

4. The second law of thermodynamics states that:
the entropy of a perfect crystal is zero at 0 K.
the entropy of the universe is constant
the energy of the universe is increasing.
the entropy of the universe is increasing.
the energy of the universe is constant.

5. 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

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