AQA Jun 2011 Paper 5 Q2

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do not write outside the box a when potassium nitrate kno dissolves in water the value of the enthalpy change h kj mol and the value of the entropy change s j k mol write an equation including state symbols for the process that occurs when potassium nitrate dissolves in water mark b suggest why the entropy change for this process is positive mark c calculate the temperature at which the free energy change g for this process is zero marks d i deduce what happens to the value of g when potassium nitrate dissolves in water at a temperature lower than your answer to part c mark d ii what does this new value of g suggest about the dissolving of potassium nitrate at this lower temperature mark turn over wmp jun chem

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