2. Rubidium has a heat of vaporization of 69.0 kJ/mol at its boiling point (686^oC). For the process Rb_(l)-->Rb_(g) at 1 atm and 686^oC. Calculate the value of DS_surroundings.
0
69.0 kJ/mol
71.9 J/K mol
61.0 kJ/mol
-71.9 J/K mol

3. A change of state occurs within a system and produces 64.0 kB of heat which is transferred to the surrounding at a constant pressure and a constant temperature of 300K. For this process DS_surroundings is:
64.0 kJ
-64.0 kJ
-213 J/K
213 J/K
none of these

4. Which of the following statements is always TRUE for a spontaneous process?

I. DS_sys > 0
II. DS_surr > 0
III. DS_univ > 0
IV. GS_sys > 0

5. 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

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