A-LevelChemistryChemical energeticsOct/Nov 2020Paper 4 Q313 Marks
(a) The energy cycle shown can be used, along with suitable data, to calculate the enthalpy change of hydration of Ca²⁺(g). Each arrow indicates a transformation, W, X, Y and Z. Each transformation consists of one or more steps. [Figure 3.1] The following data and data from the Data Booklet should be used. electron affinity of Cl(g) = -349 kJ mol-1 enthalpy change of atomisation of Ca(s) = +193 kJ mol-1 enthalpy change of formation of CaCl₂(s) = −795kJ mol-1 enthalpy change of solution of CaCl2(s) = -83 kJ mol-1 enthalpy change of hydration of Cl-(g) = -364 kJ mol-1
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