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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 DG.
0
69.0 kJ/mol
71.9 J/K mol
61.0 kJ/mol
-7.97 kJ/mol

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

I. DSsys > 0
II. DSsurr > 0
III. DSuniv > 0
IV. GSsys > 0


I
III
IV
I and III
III and IV

4. Which of these statements is false?
For a spontaneous reaction DG is negative
Independent of T, a reaction must be spontaneous if DH = 0 and DS is positive
A spontaneous reaction is always fast
A spontaneous reaction occurs without outside intervention
None of the above is false

5. 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

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