Question

Write equations for each of the following:

1) Enthalpy of atomisation of phosphorus
2) 2nd ionization enthalpy of calcium
3)1st electron affinity of oxygen
4) enthalpy of formation of propanone
5) enthalpy of lattice formation of aluminium oxide.​

Answer 1

The first electron affinity of oxygen is represented by O(g) + e− → O−(g), while the enthalpy of lattice formation for aluminium oxide is shown by 4Al3+(g) + 6O2−(g) → 2Al2O3(s).

Step-by-step explanation:

The first electron affinity of oxygen is the energy change when an electron is added to a neutral oxygen atom in the gaseous state to form a negatively charged oxide ion. The equation for this process is:

O(g) + e− → O−(g)

The enthalpy of lattice formation of aluminium oxide, Al2O3, is the energy released when gaseous ions combine to form one mole of an ionic solid. The equation representing this process is as follows:

4Al3+(g) + 6O2−(g) → 2Al2O3(s)