29 Answer All Parts Of This Question A Imagine That A Born Haber Cycle Is Being Constructed By A Colleague To Deter 1 (36.9 KiB) Viewed 15 times
29 Answer All Parts Of This Question A Imagine That A Born Haber Cycle Is Being Constructed By A Colleague To Deter 2 (25.65 KiB) Viewed 15 times
29. Answer ALL parts of this question. (a) Imagine that a Born-Haber cycle is being constructed by a colleague, to determine the lattice energy of a hypothetical magnesium halide salt, where X is the halide ion. The colleague makes the following list: First and second ionisations of Mg; 737 and 1451 Sublimation energy of Mg; 147 Electron affinity of X; 200 Atomisation enthalpy of X₂; 400 Enthalpy of formation of MgX2; -450 2+ 2e + Mg + 2X b 2+ 2e + Mg + X₂ 1451 + Mg + X₂ a Mg + X₂ Mg() + X₂ 147 Mg +2X MgX2(0) Question 29 continued on page 9...
Continuation of question 29: (b) Sadly the colleague becomes discouraged and leaves the document incomplete, simply drawing boxes around unknown quantities. Complete the calculation by writing down the boxed quantities a-f on your answer paper. You may assume that the units are kJ mol-¹. (8 marks) Write down any one type of energy term apart from 'pV work', which might be encompassed by the thermodynamic term of 'work'. Provide a brief one-sentence definition. (2 marks)
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