The average energy required to break a P - P bond in P4(s) into gaseous atoms is 53.2 kcal mol−1. The bond dissociation energy of H2(g) is 104.2 kcal mol−1; △fHo of PH3(g) from P4(s) is 5.5 kcal mol−1. The P - H bond energy in kcal mol−1 is [Neglect presence of van der Waals forces in P4(s)]
Given: P4(s) contains 6 P−P single bonds.