AQA Jun 2014 Paper 4 Q1

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section a answer all questions in the spaces provided do not write outside the box this question is about the gaseous equilibrium between compounds e f and g as shown in the equation e g f g g g h kj mol a a mol sample of e was heated in a sealed container with a mol sample of f equilibrium was established at a given temperature and the equilibrium mixture formed contained mol of g calculate the amount in moles of e and of f in this equilibrium mixture marks moles of e moles of f b write an expression for the equilibrium constant kc for this equilibrium state the units of kc marks expression units wmp jun chem do not write outside the box c a different mixture of e and f reached equilibrium at temperature t in a container of volume dm this equilibrium mixture contained mol of e mol of f and mol of g calculate a value of kc for the equilibrium at temperature t marks d the mixture in question c was allowed to reach equilibrium at temperature t in a different container of volume dm state whether the amount of g in the equilibrium mixture will increase decrease or stay the same explain your answer marks effect on the amount of g explanation e the mixture in question c was allowed to reach equilibrium at temperature t in the original container of volume dm the value of kc for the equilibrium was found to have increased state and explain which of t or t is the higher temperature marks higher temperature explanation turn over wmp jun chem

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