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1. 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

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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