please solve questions 3

2.4 (b) The volume 2.4 (c) A catalyst is added to the mixture. 2.4 (d) SO3(9) is removed from the system. Question 3 THERMOCHEMISTRY; ENTROPY, FREE ENERGY [20 Marks] 3.1 Enthalpy change (AH) and internal energy change (AU) are closely related thermodynamic concepts that are often measured as heat. Explain briefly the main difference between these concepts. (2) (2) 3.2 Is "work "a thermodynamic state function? Explain your reasoning 3.3 A student carried out the following precipitation reaction in a coffee cup calorimeter. NaCl (aq) + AgNaO (aq) AgCl (s) + NaNO3 (aq) She mixed 102 mL of 0.100 M AgNaO solution with 102 mL of 0.200 M NaCl solution. Both solutions had initial temperatures of 23.4 C. During the reaction the temperature rose to 26.3 C. The heat capacity of the coffee cup is 15.5 J/C. Specific heat of dilute solution = 4.18J/g. C and the density of dilute solution = 1.00 g/mL 3.3 (a) Determine Hrxn in kilojoule per mole of NaCl (5) 3.3 (b) What major conclusion can you draw from this precipitation reaction? (1) 3.3 (c) Determine Hrx for 22 AgCl (s) + 2NaNO3 (aq) + NaCl (aq) + AgNaO (aq) (1) [7] (1) 3.4 In the context of thermodynamics define the term free energy of a system 3.5 Explain how free energy of a thermodynamic system is related to spontaneity of a process. (1) = 3.6 The hydrogenation of ethene gas under standard conditions (T = 298.15 K) shows a decrease in disorder (AS' = -0.1207 kJ/(molK)) during an exothermic reaction (AH = -136.9 kJ/mol). C2H4 (9) + H2 (g) - C2H6 (9) 3.6 (a) Determine whether the reaction is spontaneous or nonspontaneous by calculating AG'. (3) 6