Question

( P M_{3} longrightarrow frac{1}{2} P_{2}+frac{3}{2} H_{2} )
( 9 S 4=3(P-H) )
( P_{2} H_{4} longrightarrow P_{2}+2 h_{2} )
( 1485=4(P-H)+(P-P) )
( 1485=4 times frac{954}{3}+(P-P) )
( (P-P)=-1272+1985 )
( =213 mathrm{KJ} )

# LUI The enthalpy of atomization of PHz is 954 kJ mol-' and that of P2H4 is 1485 kJ mol What is the bond enthalpy of the P-P bond?

Solution