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8:33 PM Sun 6 Feb 94% warn-ap-southeast-2-prod-luetolythes, content blackbowdeda.com QUESTION 3 (10 MARKS) a) 2HBr (g) → H2(g) + Br2 (g) The rate equation for the thermal decomposition of hydrogen bromide is rate=k[HBr)? At 250 °C and a concentration of 1,20 mol dm, the rate of decomposition of hydrogen bromide is 3.5 x 10* mol dm's'. i. Calculate the rate constant for the reaction at 250 °C (state its unit). ii. Calculate the number of hydrogen molecules formed per second (rate of formation) in Idm of solution. (Avogadro number: 6.02 x 10-) b) (2 + 1 marks) The data below was obtained from the reaction X+Y+Z → products. Experiment Concentration (mol dm) Initial rate X Y Z (mol dm's') 1 0.1 0.1 0.1 1.0 2 0.2 0.1 0.1 2.0 3 0.1 0.2 0.1 4.0 4 0.1 0.1 0.2 1.0 i. Find the order of reaction with respect to X, Y and Z. ii. Write the rate equation (rate law) and determine the total order of reaction

i. Find the order of reaction with respect to X, Y and Z. ii. Write the rate equation (rate law) and determine the total order of reaction (3 + 2 marks) The activation energy of a certain first order reaction is 75 kJ mol'. At 27 °C, the rate constant of the reaction is 8.8 s'. What is the rate constant of the reaction if the temperature is increased to 37 °C? (R-8.31 J mol'k') (2 marks) c)