2. DS for the universe is:
always positive sometimes positive always negative sometimes negative constant
3. 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
4. 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
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 DG.
0 69.0 kJ/mol 71.9 J/K mol 61.0 kJ/mol -7.97 kJ/mol
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