Chemical Thermodynamics Question 183

Question: The heat of formations of $ CO(g) $ and $ CO_2(g) $ are $ -26.4 $ kcal and $ -94.0 $ kcal respectively. The heat of combustion of carbon monoxide will be [MP PET/PMT 1988; EAMCET 1993]

Options:

A) $ +26.4,kcal $

B) $ -67.6,kcal $

C) $ -120.6,kcal $

D) $ +52.8,kcal $

Show Answer

Answer:

Correct Answer: B

Solution:

Aim: $ CO+\frac{1}{2}O_2\to CO_2 $

$ \Delta H=\Delta H_{f}^{0},(CO_2)-[ \Delta H_{f}^{0}(CO)+\frac{1}{2}\Delta H_{f}^{0}(O_2) ] $

$ =-,94.0-(-26.4)=-67.6kcal. $



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