Question

The PP bond energy is X KJ/mole then the energy needed for the dissociation of 124 grams of white phosphorus is

Answer 1

Atomic weights: P=31
124 g p means 124/31 p atoms.
Ie , 4 p atoms.

The 4 P atoms are in a tetrahedron (trigonal pyramid).shape is found out by vsepr theory.

so there are 6 P-P bonds.

For breaking 1 p-p bond, we need X kj/mol.

Therefore, for breaking of 6 p-p bond, we need
6xX kj/mol energy.

Answer is 6X kj/mol.