2. For the phase change of liquid to solid, DS is:
0 positive negative positive at high temperature 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. 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. A change of state occurs within a system and produces 64.0 kB of heat which is transferred to the surrounding at a constant pressure and a constant temperature of 300K. For this process DSsurroundings is:
64.0 kJ -64.0 kJ -213 J/K 213 J/K none of these
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