So /Jmol.1 K-1 ?HP / kJ mol-¹ Ca(OH)2(s) 83.4 -986.1 NH4Cl(s) +94.9 -314.6 CaCl₂ (s) 104.6 -795.8 NH3(g) 192.3 -45.9 H₂O(1) +69.9 -285.8 a) The reaction between solid calcium hydroxide and solid ammonium chloride produces solid calcium chloride, ammonia gas and liquid water. Write the balanced equation for this reaction, including state symbols. b) Why is the standard entropy of liquid water less than the standard entropy of ammonia gas? c) Use the values in the table above to calculate reaction standard entropy change, AS. d) Use the values in the table above to calculate the reaction standard enthalpy change, AH. e) Use your answers to (c) and (d) to calculate the Gibbs free energy change, AG, at 298K. Is the reaction feasible at this temperature ? f) Calculate the lowest temperature, in Kelvin, at which the reaction is feasible.

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