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Tut 5 Q 8

Tut 5 Q 8. Justinian Tang. Q8. (a). Magnesium chloride is one of the most abundant salts in sea-water. Construct a Born-Haber cycle for the formation of . Using the cycle you drew, the data provided below and the relevant data in the Data Booklet to calculate the lattice energy of . Data.

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Tut 5 Q 8

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  1. Tut 5 Q 8 Justinian Tang

  2. Q8. (a) • Magnesium chloride is one of the most abundant salts in sea-water. • Construct a Born-Haber cycle for the formation of . Using the cycle you drew, the data provided below and the relevant data in the Data Booklet to calculate the lattice energy of .

  3. Data • Data Provided: • Enthalpy change of atomisation of  +148 kJ mol-1 • Electron affinity of chlorine atom  -349 kJ mol-1 • Enthalpy change of formation of  -641 kJ mol-1 • Relevant Data in Data Booklet: • Bond Energy of Cl-Cl bond  244 kJ mol-1 • First Ionization Energy of  736 kJ mol-1 • Second Ionization Energy of  1450 kJ mol-1

  4. Born-Haber Cycle of Energy/kJ mol-1 Lattice Energy +148 0

  5. Measuring Lattice Energy

  6. Q8. (b) • Use the following data, together with relevant data given in (a) to calculate a value for the enthalpy change of solution of magnesium chloride. • Following Data: • Ion • Relevant Data from (a): •  -641 kJ mol-1

  7. Measuring

  8. End • Any Questions?

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