a) 2HBr (g) → H2(g) + Br2 (g) The rate equation for the thermal decomposition of hydrogen bromide is rate=k[HBr]? At 250

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A 2hbr G H2 G Br2 G The Rate Equation For The Thermal Decomposition Of Hydrogen Bromide Is Rate K Hbr At 250 1 (235.73 KiB) Viewed 57 times

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 104 mol dms! 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 1dm’ of solution. (Avogadro number: 6.02 x 1023) (2 + 1 marks) b) The data below was obtained from the reaction X+Y+Z → products. Experiment X Z 1 2 3 4 0.1 0.2 0.1 0.1 Concentration (mol dm) Y 0.1 0.1 0.1 0.1 0.2 0.1 0.1 0.2 Initial rate (mol dms') 1.0 2.0 4.0 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 (3 + 2 marks) ) c) 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 sł. What is the rate constant of the reaction if the temperature is increased to 37 °C? (R=8.31 J mol-'K) (2 marks)