Question 7 a) Consider the following reaction at equilibrium: 2NO(g) + O₂(g) = 2NO₂(g) AH° -116 kJ mol-1 i) Write an exp

[answerhappygod]

Question 7 A Consider The Following Reaction At Equilibrium 2no G O G 2no G Ah 116 Kj Mol 1 I Write An Exp 1 (195.08 KiB) Viewed 14 times

Question 7 a) Consider the following reaction at equilibrium: 2NO(g) + O₂(g) = 2NO₂(g) AH° -116 kJ mol-1 i) Write an expression for Kc for this reaction. (1 mark) ii) The reaction was allowed to reach equilibrium at 350 K in a container of volume 2.50 dm³. The equilibrium mixture was found to contain 0.85 mol of NO, and 0.9 mol of O₂. Kc for this equilibrium was found to be 4.39 mol-¹ dm³. Calculate the concentration of NO2 in this equilibrium mixture, and hence the number of moles of NO2 at equilibrium. Show full details of your working. (3 marks) iii) The reaction was allowed to reach equilibrium in a container of the same volume, but at a different temperature, T2. The value of Kc in this case was found to be lower. State and explain whether T2 is higher or lower than 350 K. (2 marks) b) 0.124 g of a volatile liquid hydrocarbon was vaporised at a temperature of 100°C and a pressure of 1 atm. The volume of vapour measured under these conditions was 45.3 cm³. Calculate the molar mass of this hydrocarbon. Show full details of your working. (4 marks) 12 Data sheet Table B Table A Infrared absorption data ¹H NMR chemical shift data Bond Wavenumber /cm-1 Type of proton ROH N-H 3300-3500 (amines) RCH3 RNH₂ 3230-3550 O-H (alcohols) R₂CH₂ C-H 2850-3300 R3CH O-H 2500-3000 R-C-C- (acids) OH CEN 2220-2260 C=O 1680-1750 R-O-C- C=C 1620-1680 H RCH₂Cl or Br C-O 1000-1300 C-C 750-1100 R-C-0- Ö H R H R-C H R-CO O-H Specific heat capacity for water = 4.18 J g-¹ °C-1 Gas constant, R = 8.314 J K-¹ mol-¹ 8/ppm 0.5-5.0 0.7-1.2 1.0-4.5 1.2-1.4 1.4-1.6 2.1-2.6 3.1-3.9 3.1-4.2 3.7-4.1 4.5-6.0 9.0-10.0 10.0-12.0