Use standard free energy data from the table below to calculate the standard free energy change for the reaction below (at 298 K). CoCl2(g) Co(g) + Cl2(g) Your answer should include four significant figures. Substance AG kJ 'f mol kJ of mol AH₤ $298 mol K J CoCl2(g) -269.9 -312.5 109.2 Co(g) 0 0 30.10 Cl2(g) 0 0 223.0 Provide your answer below: kJ/mol

For the reaction NO(g)+NO2(g)N2O3(g) , use tabulated thermodynamic data to calculate H and S. Then use those values to answer the following questions. (a) Is this reaction spontaneous at 25°C? Explain your answer. (b) If the reaction is not spontaneous at 25°C, will it become spontaneous at higher temperatures or lower temperatures? (c) To show that your prediction is accurate, choose a temperature that corresponds to your prediction in part (b) and calculate G . (Assume that both enthalpy and entropy are independent of temperature.)

How is the sign of q, heat, defined? How does it relate to the total energy of the system?

What is the second law of thermodynamics? For any process, there are four possible sign combinations for Ssys and Ssurr. Which sign combination(s) always give a spontaneous process? Which sign combination(s) always give a non-spontaneous process? Which sign combination(s) may or may not give a spontaneous process?