2. 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.
3. 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
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. 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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