2. 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
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. 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 DS.
0 69.0 kJ/mol 71.9 J/K mol 61.0 kJ/mol -7.97 kJ/mol
5. Liquid sample A freezes at -8°C. Determine the signs of DH, DS, and DG.
+,+,+ +,-,- -,-,- -,+,0 None of the above
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