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1. For the gas sample B, this reaction is endothermic: B-->2B. The reaction is:
always spontaneous
only at high temperatures
only at low temperatures
never spontaneous
none of the above

2. Which statement is TRUE?
DS decreases with an increase in volume
free energy is independent of volume
free energy is independent of pressure
free energy is dependent on pressure
none of the above

3. 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 DSsurroundings.
0
69.0 kJ/mol
71.9 J/K mol
61.0 kJ/mol
-71.9 J/K mol

4. For a reaction, the DS = -30J/K and DH=25kJ. Is this reaction spontaneous at STP?
no
yes
need more info
only at high pressures
only at low pressures

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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