AQA Jun 2010 Paper 1 Q3

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do not write outside the box in this question give all your answers to three significant figures magnesium nitrate decomposes on heating to form magnesium oxide nitrogen dioxide and oxygen as shown in the following equation mg no s mgo s no g o g a thermal decomposition of a sample of magnesium nitrate produced g of magnesium oxide a i calculate the amount in moles of mgo in g of magnesium oxide marks a ii calculate the total amount in moles of gas produced from this sample of magnesium nitrate mark b in another experiment a different sample of magnesium nitrate decomposed to produce mol of gas calculate the volume in dm that this gas would occupy at k and pa the gas constant r j k mol marks extra space wmp jun chem do not write outside the box c a mol sample of magnesium oxide produced from the decomposition of magnesium nitrate was reacted with hydrochloric acid mgo hcl mgcl h o c i calculate the amount in moles of hcl needed to react completely with the mol sample of magnesium oxide mark c ii this mol sample of magnesium oxide required cm of hydrochloric acid for complete reaction use this information and your answer to part c i to calculate the concentration in mol dm of the hydrochloric acid mark turn over for the next question turn over wmp jun chem do not write outside the box a there are several oxides of nitrogen an oxide of nitrogen contains by mass of nitrogen determine the empirical formula of this oxide marks extra space b give one reason why the oxide no is a pollutant gas mark c the oxide no reacts with oxygen to form nitrogen dioxide write an equation for this reaction mark d explain how no is produced in the engine of a motor vehicle marks e write an equation to show how no is removed from the exhaust gases in motor vehicles using a catalytic converter mark wmp jun chem

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