AQA Jan 2013 Paper 1 Q5

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section b answer all questions in the spaces provided do not write outside the box ammonia is used to make nitric acid hno by the ostwald process three reactions occur in this process reaction reaction reaction nh g o g no g h o g no g o g no g no g h o i hno aq no g a in one production run the gases formed in reaction occupied a total volume of m at c and kpa calculate the amount in moles of no produced give your answer to significant figures the gas constant r j k mol marks extra space wmp jan chem do not write outside the box b in another production run kg of ammonia gas were used in reaction and all of the no gas produced was used to make no gas in reaction b i calculate the amount in moles of ammonia in kg marks b ii calculate the mass of no formed from kg of ammonia in reaction assuming an yield give your answer in kilograms if you have been unable to calculate an answer for part b i you may assume a value of mol this is not the correct answer marks extra space question continues on the next page turn over wmp jan chem do not write outside the box c consider reaction in this process no g h o i hno aq no g calculate the concentration of nitric acid produced when mol of no is reacted with water and the solution is made up to cm marks extra space d suggest why a leak of no gas from the ostwald process will cause atmospheric pollution mark e give one reason why excess air is used in the ostwald process mark f ammonia reacts with nitric acid as shown in this equation nh hno nh no deduce the type of reaction occurring mark wmp jan chem

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