The enthalpy of atomization of PH3(g) is +954 kJ mol and that of P2H4
+1488 kJ mol-1. The bond energy of P-P bond is
(A) +318 kJ mol-1
(B) 372 kJ mol-1
(C) 216 kJ mol-1
(D) 534 kJ mol-1
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Answer:
Energy required to break CH
2
−CH
3
into its constituents atoms is 2860KJ .
CH
3
−CH
3
contain 6 C−H bonds, 1 C−C bond.
∴2860=6 [Bond energy of C−H bond]+1[Bond energy of C−C]
⇒2860=6[420]+[Bond energy of C−C]
∴ Bond energy of C−C is 340KJ .
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