AQA Jun 2010 Paper 4 Q2

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do not write outside the box the reaction of methane with steam produces hydrogen for use in many industrial processes under certain conditions the following reaction occurs ch g h o g co g h g h kj mol a initially mol of methane and mol of steam were placed in a flask and heated with a catalyst until equilibrium was established the equilibrium mixture contained mol of carbon dioxide a i calculate the amounts in moles of methane steam and hydrogen in the equilibrium mixture moles of methane moles of steam moles of hydrogen marks a ii the volume of the flask was dm calculate the concentration in mol dm of methane in the equilibrium mixture mark b the table below shows the equilibrium concentration of each gas in a different equilibrium mixture in the same flask and at temperature t gas concentration mol dm ch g h o g co g h g b i write an expression for the equilibrium constant kc for this reaction mark wmp jun chem do not write outside the box b ii calculate a value for kc at temperature t and give its units calculation units of kc marks c the mixture in part b was placed in a flask of volume greater than dm and allowed to reach equilibrium at temperature t state and explain the effect on the amount of hydrogen effect on amount of hydrogen explanation marks d explain why the amount of hydrogen decreases when the mixture in part b reaches equilibrium at a lower temperature marks turn over for the next question turn over wmp jun chem

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