First slide

Enthalpy of Atomisation and bond dissociation

Question

$∆ H_{C \equiv O}, ∆ H_{O = O}, ∆ H_{C = O}$ respectively are 1070, 498 and 741KJ/mol. Then ΔH for $CO + \frac{1}{2} O_{2} \to {CO}_{2}$ [in KJ] is

Moderate

Solution

$\begin{array}{l} {\Delta _r}{H^o} = B{E_{C \equiv O}} + \frac{1}{2}B{E_{O = O}}[ - 2B{E_{C = O}}]\\\\ \,\,\,\,\,\,\,\,\,\,\,\,\,\, = \,1070 + {\textstyle{{498} \over 2}} - [2 \times 741]\\\\ \,\,\,\,\,\,\,\,\,\,\,\,\,\, = - 163KJ\\ \,\,\,\,\,\,\,\,\,\,\,\,\,\, \end{array}$

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