AQA Jan 2012 Paper 1 Q6

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section b answer all questions in the spaces provided do not write outside the box the metal lead reacts with warm dilute nitric acid to produce lead ii nitrate nitrogen monoxide and water according to the following equation pb s hno aq pb no aq no g h o i a in an experiment an g sample of lead reacted completely with a mol dm solution of nitric acid calculate the volume in dm of nitric acid required for complete reaction give your answer to significant figures marks extra space wmp jan chem do not write outside the box b in a second experiment the nitrogen monoxide gas produced in the reaction occupied cm at kpa and k calculate the amount in moles of no gas produced the gas constant r j k mol marks extra space c when lead ii nitrate is heated it decomposes to form lead ii oxide nitrogen dioxide and oxygen c i balance the following equation that shows this thermal decomposition pb no s pbo s no g o g mark c ii suggest one reason why the yield of nitrogen dioxide formed during this reaction is often less than expected mark c iii suggest one reason why it is difficult to obtain a pure sample of nitrogen dioxide from this reaction mark turn over wmp jan chem

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