Question

The reaction can be speeded up by using a catalyst that reduces the activation energy. The most popular catalysts are based on iron (Fe) and ruthenium (Ru). The table shows the variation in the concentration of N2(g) as a function of time for a reaction carried out at 500 °C and 200 atm in the presence 0 0.2 0.3 0.4 0.5 0.6 of an Fe catalyst: [N,(e)] (mol/L) 2.00 1.68 1.42 1.19 1.01 0.846 0.710 0.1 7. Use these data to determine a) the order of the reaction with respect to N2(g) and b) the value of the overall rate constant k for the synthesis process at the given conditions (graphing method, you will need a spreadsheet program: e.g., Excel, google sheets). In the presence of a solid catalyst, the reaction takes place on the surface of the solid. The following image depicts the reaction path for the synthesis of NH, from N2 and H2 over the surface of a ruthenium (Ru) catalyst. The symbol o denotes an empty site on the catalyst and X* represents an adsorbed species NH, 3H2 NH, 8. Identify the rate-limiting step in the process. 9. Derive the overall rate law for the reaction in the presence of a catalyst. +N2 + 3H2 N2 + 3H2 2N. +3H2 . +2NH NH3 +NH N. +NH3 +3H. N. + NH3 +3H- NH+ + NH3 +2H+ NH, NH3 +H. N.+NH+4H. 2N. +6H. N+ + NH4 +5H 10. Discuss the effect on rate of doubling pressure of N, and Hz.

Answer 1

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