AQA Jun 2011 Paper 4 Q6

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do not write outside the box a in the presence of the catalyst rhodium the reaction between no and h occurs according to the following equation no g h g n g h o g the kinetics of the reaction were investigated and the rate equation was found to be rate k no h the initial rate of reaction was mol dm s when the initial concentration of no was mol dm and the initial concentration of h was mol dm a i calculate the value of the rate constant under these conditions and give its units calculation units marks a ii calculate the initial rate of reaction if the experiment is repeated under the same conditions but with the concentrations of no and of h both doubled from their original values mark wmp jun chem do not write outside the box b using the rate equation and the overall equation the following three step mechanism for the reaction was suggested x and y are intermediate species step step step no no x y n h o x h y h suggest which one of the three steps is the rate determining step explain your answer rate determining step explanation marks extra space turn over for the next question turn over wmp jun chem

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