ThermochemistryHard
Question
Calculate the magnitude of resonance energy of CO2 from the following data (in kJ/mol).
Bond energies: C=O = 539.0, O=O = 498.0
Heat of sublimation of C(s) = 718.0
Heat of combustion of C(s) = −393.0
Options
A.255
B.531
C.138
D.247
Solution
$C(s) + O_{2}(g) \rightarrow CO_{2}(g);\Delta H = - 393\text{ kJ}$
Now, $( - 393) = \lbrack 718 + 498\rbrack - 2 \times 539 - |R.E.|_{CO_{2}}$
$\therefore|R.E.|_{CO_{2}} = 531\text{ kJ/mol}$
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