(2) (a) For the equilibrium reaction: PCIS (g) = PCI; (g) + Cl2 (9) AHR = + 90 kJ mot? Explain the effects of the following on the position of equilibrium and the equilibrium constant: C) Increased temperature. (2 marks) (ii) Decreased volume of the container in which the reaction occurs. (2 marks) (iii) Addition of extra Cl2 (9). (2 marks) (iv) Addition of a noble gas. (2 marks) (b) Hydrazine, NaHa, is a colourless and flammable liquid. Some mean bond enthalpy values for reactions involving hydrazine are given below. Bond Mean bond enthalpy / kJ mo? N-H 391 N-N 163 H-H 436 NEN 944 O=0 496 (0) Write an equation for the reaction with an enthalpy change equal to the enthalpy of formation of hydrazine. (2 marks) (1) Using the data provided above, estimate a value for the enthalpy of formation of hydrazine. (3 marks) () Hydrazine undergoes combustion to form nitrogen and water according to the equation: NzH4 (1) + O2 (9) -- N2 (9) + 2 H20 (1) Using your answer to part (i) and the enthalpy of formation of water, H20 (1). which is -286 kJ mol-, what is the enthalpy of combustion of hydrazine? (3 marks) (c) Divanadium trioxide, V20s, is a crystalline solid under standard conditions. 0 Construct a diagram showing the Bom-Haber cycle for the formation of the compound V20, from vanadium and oxygen in their standard states. Include reactions and labels defining the enthalpy changes for each step in the cycle. The diagram does not need to be to scale but should show all the relevant processes