Answer Happy

Continued... 31. Answer ALL parts of this question. Silver chloride (AgCl) is sparingly soluble in water, with an equilibrium constant at 298 K of 1.8 x 10-10. (a) Determine the standard Gibbs free energy change of reaction, AGⓇ for the dissolution of AgCl. (2 marks) (b) State whether you would expect the dissolution of AgCl in water to be an entropically favourable or unfavourable process, briefly explaining your answer. (2 marks) (c) The dissolution of AgCl is known to be an endothermic process. Explain why, including in your answer a definition of the term 'endothermic'. (2 marks) a (d) Briefly explain the basic principles of a constant pressure calorimeter, and describe how this could be used to determine the enthalpy of dissolution of AgCl. (3 marks) (e) Calculate the molar solubility of AgCl in water at 298 K. (1 mark) II
32. Answer ALL parts of this question. An electron is confined to a one dimensional box of length 580 pm. The potential energy inside the box is zero and outside it is infinite. (a) Describe the main characteristics of an acceptable wave function. (2 marks) (b) Describe the boundary conditions that the system imposes on the allowed wave functions of the electron in the box described above. (2 marks) (c) Sketch the first three (ie n = 1 to 3) allowed wave functions of the above system and indicate for each the most probably location of the electron represented by each of the wave functions. Explain your reasons. (3 marks) (d) The energies of the wave functions of the above system are given by E = nh2 8m 22 а Calculate the energy of the transition of an electron between states 2 and 3. Comment on the validity of the particle in a box model to represent the butadiene molecule which has an experimental value of 217 nm for the corresponding transition. (3 marks)