1 Born-Haber Cycles enthalpy H magnesium chloride MgCl 2 (s) Mg 2+ (g) + 2Cl - (g) H lattice Mg (s)...

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1 Born-Haber Cycles enthalpy H magnesium chloride MgCl 2 (s) Mg 2+ (g) + 2Cl - (g) H lattice Mg (s) + Cl 2 (g) H formation H atomisation Mg (g) + Cl 2 (g) H first ionisation energy Mg + (g) + e - + Cl 2 (g) Mg 2+ (g) + 2e - + 2Cl (g) H second ionisation energy 2 x H first electron affinity Mg 2+ (g) + 2e - + Cl 2 (g) H bond energy of chlorine Mg (s) + Cl 2 (g)

Transcript of 1 Born-Haber Cycles enthalpy H magnesium chloride MgCl 2 (s) Mg 2+ (g) + 2Cl - (g) H lattice Mg (s)...

Page 1: 1 Born-Haber Cycles enthalpy H magnesium chloride MgCl 2 (s) Mg 2+ (g) + 2Cl - (g) H lattice Mg (s) + Cl 2 (g) H formation H atomisation Mg (g) + Cl.

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Born-Haber Cycles

enthalpy H

magnesium chloride

MgCl2 (s)

Mg2+ (g) + 2Cl- (g)

H lattice

Mg (s) + Cl2 (g)

H formation

H atomisation

Mg (g) + Cl2 (g)

H first ionisation energy

Mg+(g) + e- + Cl2 (g)

Mg2+(g) + 2e- + 2Cl (g)

H second ionisation energy

2 x H first electron affinityMg2+(g) + 2e- + Cl2 (g)

H bond energy of chlorine

Mg (s) + Cl2 (g)

Page 2: 1 Born-Haber Cycles enthalpy H magnesium chloride MgCl 2 (s) Mg 2+ (g) + 2Cl - (g) H lattice Mg (s) + Cl 2 (g) H formation H atomisation Mg (g) + Cl.

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Born-Haber Cycles

enthalpy H

magnesium chloride

MgCl2 (s)

Mg2+ (g) + 2Cl- (g)

H lattice

Mg (s) + Cl2 (g)

H formation

H atomisation

Mg (g) + Cl2 (g)

H first ionisation energy

Mg+(g) + e- + Cl2 (g)

Mg2+(g) + 2e- + 2Cl (g)

H second ionisation energy

2 x H first electron affinityMg2+(g) + 2e- + Cl2 (g)

H bond energy of chlorine

Page 3: 1 Born-Haber Cycles enthalpy H magnesium chloride MgCl 2 (s) Mg 2+ (g) + 2Cl - (g) H lattice Mg (s) + Cl 2 (g) H formation H atomisation Mg (g) + Cl.

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Apply Hess’s Law to calculate ∆HLattice Energy for MgCl2setting out the values in a methodical manner:

1 = 2 + 3 + 4 + 5 + 6 + 7

-641 = +148 + 738 + 1451 + 242 + (2x-364) + ∆HLE

-641 = + 1851 + ∆HLE

∆HLE = - 1851 - 641

= - 2492 kJ mol-1


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