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Question 4 (14 marks) Copper (II) sulphide can be reduced by hydrogen at high temperatures according to the equation Cus(s)+ H,(g)-Cus)+H,S(g) For the reaction above the standard reaction enthalpy is ArH 33.0 kJ mol1 and standard reaction entropy is ?,so-42.01 Calculate the molar composition of the output gas (hydrogen sulphide-hydrogen mixture) in equilibrium if the reaction is carried out at T- 700 K with an excess of CuS Assume that the solids (CuS and Cu) do not mix and are present as pure phases. (14 marks)

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