What is born Haber cycle explain formation of NaCl?

Cl(g)+e−→Cl−(g),△H=△HEa. Step 5: Close packing of gaseous sodium ion and chloride ion to form the lattice structure of NaCl, with lattice chloride ion to form a lattice structure of NaCl with Lattice energy = U. NaCl+(g)+Cl−(g)→NaCl△;△H=U.

What is the lattice enthalpy of NaCl?

For NaCl, the lattice formation enthalpy is -787 kJ mol-1.

How do you calculate Born Haber cycle?

Born – Haber Cycle Equation Heat of formation= Dissociation Energy + Sublimation Energy + Ionization Energies – Electronic Affinities + Lattice Energy.

What is born Haber cycle explain with example?

A Born–Haber cycle applies Hess’s law to calculate the lattice enthalpy by comparing the standard enthalpy change of formation of the ionic compound (from the elements) to the enthalpy required to make gaseous ions from the elements.

What is born Haber cycle How does it explain the stability of ionic compounds?

Ionic solids tend to be very stable compounds. The enthalpies of formation of the ionic molecules cannot alone account for this stability. These compounds have an additional stability due to the lattice energy of the solid structure.

Which step in the Born Haber cycle will typically be exothermic?

The fourth step is the addition of an electron to a gaseous chlorine atom, which is defined as the electron affinity (EA) of chlorine and is represented by EA. This step is exothermic, with EA of chlorine being -349 KJ. So, from the third and the fourth steps we get sodium and chloride ions.

How do you calculate the enthalpy of formation of NaCl?

NaCl(g) → Na+ (g) + Cl- (g) only. Lattice enthalpy value from ∆ H0(5) is written with a reversed sign. ∴ Lattice enthalpy of NaCl = +788.0 kJ mol-1.

What is lattice in chemistry?

A lattice is an ordered array of points describing the arrangement of particles that form a crystal. The unit cell of a crystal is defined by the lattice points. In the structure drawn, all of the particles (yellow) are the same.

Which step in the Born Haber cycle will typically be endothermic?

As you can see in the accompanying diagram, the first step involves formation of gaseous sodium metal from solid sodium metal. This is called the sublimation energy of sodium, and represented by Hsub. This step is endothermic, with sublimation energy of sodium being +108 KJ.

Which step in the Born-Haber cycle will typically be endothermic?

Which of the following statements describe the Born-Haber cycle correctly?

– The Born-Haber cycle correctly defines the steps that precede the formation of an ionic solid. – The lattice energy has the same value (but opposite sign) as the enthalpy formation of the ionic solid from a mole of gaseous ions. – The energy of sublimation is used in Born-Haber cycle calculations.

Which steps of the Born Haber cycle are endothermic?

What is the Born-Haber cycle in chemistry?

It is ultimately the lattice energy of an ionic crystal which is responsible for the formation and stability of ionic crystal structures. For sodium chloride, the Born – Haber cycle is: A cycle of this type is an example of Hess’s Law. It can be used to calculate any of the six enthalpies, given the other five.

How to calculate lattice energy from a Born-Haber cycle?

We can alternatively construct a Born-Haber cycle for the formation of NaCl from the elements and calculate the lattice energy as the “missing” term in the cycle. Here we have to subtract 2RT to convert our cycle of energies to a cycle of enthalpies, because we are compressing two moles of gas in making NaCl (s) and PΔV = ΔnRT, where Δn = -2.

How can I calculate the lattice energy of NaCl?

To calculate the lattice energy, we lump together the physical constants: where r o is expressed in Å. Now we can calculate the lattice energy for NaCl using r o = 2.814 Å, as: We can alternatively construct a Born-Haber cycle for the formation of NaCl from the elements and calculate the lattice energy as the “missing” term in the cycle.