2. 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
3. Which of the following will be true when a pure substance in liquid phase freezes spontaneously?
DG, DH, and DS are all positive DG, DH, and DS are all positive
4. Which of the following favors a negative DG?
increasing energy and increasing entropy lowering energy and increasing entropy increasing energy and decreasing entropy lowering energy and decreasing entropy none of the above
5. 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
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