2. Probability and entropy [8 pts] A certain process can take a system between two states A → B. The enthalpy change of

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2 Probability And Entropy 8 Pts A Certain Process Can Take A System Between Two States A B The Enthalpy Change Of 1 (51.41 KiB) Viewed 72 times

2. Probability and entropy [8 pts] A certain process can take a system between two states A → B. The enthalpy change of the process is AH = + 20 kJ/mol while the change of entropy is AS = +48 J/mol. K. (a) [1 pts] Which of the following is definitely true about this process? 1) It will never occur spontaneously. 2) It will always occur spontaneously. 3) It will only occur spontaneously at high temperatures. 4) It will only occur spontaneously at low temperatures. (b) [2 pts] Explain your answer for part (a) above (c) [2 pts] At a temperature T = 300 K does the process require an increase or a decrease in Gibbs free energy? By how much? Is the process spontaneous or not at this temperature? (d) [3 pts] By changing the pressure you lower the enthalpy change of the process to AH = + 15 kJ/mol. Calculate the cut-off temperature at which the system is in equilibrium between the two states A and B. Explain wether the process is spontaneous or not above and below this temperature.