AQA Jun 2013 Paper 4 Q2

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do not write outside the box when heated above c nitrosyl chloride nocl partly decomposes to form nitrogen monoxide and chlorine as shown in the equation nocl g no g cl g a a mol sample of nocl was heated in a sealed container and equilibrium was established at a given temperature the equilibrium mixture formed contained mol of no calculate the amount in moles of cl and of nocl in this equilibrium mixture moles of cl moles of nocl marks b a different mixture of nocl no and cl reached equilibrium in a sealed container of volume dm the equilibrium mixture formed contained mol of nocl and mol of no at temperature t the value of kc for the equilibrium at temperature t was mol dm b i write an expression for the equilibrium constant kc mark b ii calculate the amount in moles of cl in this equilibrium mixture marks extra space wmp jun chem do not write outside the box b iii consider this alternative equation for the equilibrium at temperature t nocl g no g cl g calculate a value for the different equilibrium constant kc for the equilibrium as shown in this alternative equation deduce the units of this kc calculation units marks turn over for the next question turn over wmp jun chem

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