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constants
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1. 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

2. DS for the universe is:
always positive
sometimes positive
always negative
sometimes negative
constant

3. For the phase change of liquid to solid, DS is:
0
positive
negative
positive at high temperature
none of the above

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

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