Born-Haber Cycles

Question 1

Explain a born haber cycle

Answer 1

Metal element and none metal element with endo arrow to gaseous ions by atomising and ionising, then from gaseous ions to compound by lattice energy and from the elements to compound by enthalpy change of formation of compound

Question 2

Why are born haber cycles used

Answer 2

As all the professes in the cycle can be determined from experimental data except the lattice energy

Question 3

How to calculate lattice energy from born-Haber cycle

Answer 3

Enthalpy of formation - (enthalpy of atomisation and ionisation of elements)

Question 4

Are ionisation and atomisation energies exo or endo

Answer 4

Endo

Question 5

Which are the exothermic processes of born-haber cycle

Answer 5

Lattice energy, standard enthalpy change of formation, first electron affinity

Question 6

Born haber cycle for Na2O

Answer 6

2Na(s) + 1/2 O2(g)
Atomisation x2 Na 2Na(g) + 1/2 O2
2IonisationNa 2Na+(g) + 2e- + 1/2 O2(g)
Atomisation O 2Na+ + 2e- + O(g)
Sum of first and second EA for O
2Na+(g) + O2-(g)
Lattice energy of sodium oxide
Na2O(s)
Also from the atoms to Na2O(s) for standard enthalpy change of formation