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5. Thermodynamics and thermochemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
The heat of formations of $CO(g)$ and $C{O_2}(g)$ are $ - 26.4$ $kcal $ and $ - 94.0$ $ kcal$  respectively. The heat of combustion of carbon monoxide will be.....$kcal$
  • A
    $ + 26.4$
  • ✓
    $ - 67.6$
  • C
    $ - 120.6$
  • D
    $ + 52.8$
✓

Answer

Correct option: B.
$ - 67.6$
(b)Aim: $CO + \frac{1}{2}{O_2} \to C{O_2}$
$\Delta H = \Delta H_f^o\,(C{O_2}) - \left[ {\Delta H_f^o(CO) + \frac{1}{2}\Delta H_f^o({O_2})} \right]$
$ = - \,94.0 - ( - 26.4) = - 67.6\,\,kcal.$

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