First slide

Enthalpy of Atomisation and bond dissociation

Question

Bond enthalpies of P-P, O=O and P-O are p, q and s respectively. Enthalpy change for the process, P₄+3O₂→P₄O₆ is

Moderate

A

4p + 3q - 6s
B

6p + 3q - 16s
C

4p + 3q - 12s
D

6p + 3q - 12s

Solution

$6 (P - P) + 3 (O = O) - 12 (P - O) = ∆ H$
+6P + 3q - 12s = $∆$ H

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