AQA Specimen Paper 1 Q5

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12 Table 3 contains some entropy data relevant to the reaction used to synthesise methanol from carbon dioxide and hydrogen. The reaction is carried out at a temperature of 250 C. Table 3 Substance Entropy (S) / J K1 mol1 CO2(g) H2(g) CH3OH(g) H2O(g) 214 131 238 189 CO2(g) + 3H2(g) CH3OH(g) + H2O(g) H = 49 kJ mol1 . 1 0 5 Use this enthalpy change and data from Table 2 to calculate a value for the free-energy change of the reaction at 250 C. Give units with your answer. [4 marks] Free-energy change = Units = Barcode Typesetter code<br /> 13 Calculate a value for the temperature when the reaction becomes feasible. [2 marks] Temperature = Gaseous methanol from this reaction is liquefied by cooling before storage. Draw a diagram showing the interaction between two molecules of methanol. Explain why methanol is easy to liquefy. [4 marks] Diagram Explanation . 2 0 5 . 3 0 5 Barcode Typesetter code Turn over <br />

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