AQA Jun 2015 Paper 4 Q2

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sulfur dioxide reacts with oxygen to form sulfur trioxide according to the equation do not write outside the box so g o g so g a write an expression for the equilibrium constant kc for this reaction and deduce its units marks kc units b samples of sulfur dioxide oxygen and sulfur trioxide were added to a flask of volume dm and allowed to reach equilibrium at a given temperature the flask contained mol of sulfur dioxide and mol of sulfur trioxide at equilibrium kc has the numerical value of under these conditions calculate the amount in moles of oxygen gas in this equilibrium mixture marks wmp jun chem do not write outside the box c the experiment in question b was repeated with the same amounts of sulfur dioxide oxygen and sulfur trioxide at the same temperature but in a smaller flask the mixture was allowed to reach equilibrium c i state the effect if any of using a smaller flask on the value of kc mark c ii state the effect if any of using a smaller flask on the amount of sulfur trioxide at equilibrium explain your answer marks effect explanation turn over for the next question turn over wmp jun chem

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