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  4. Heat of combustion of carbon monoxide at constant volume and at 17° C is -67,710 cal. The heat of combustion at constant pressure is

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Q. Heat of combustion of carbon monoxide at constant volume and at $17^{\circ} C$ is $-67,710\,cal$. The heat of combustion at constant pressure is

J & K CETJ & K CET 2007Thermodynamics

Solution:

$CO (g)+\frac{1}{2} O _{2}(g) \rightarrow CO _{2}(g)$
$\Delta H=\Delta E+\Delta n R T$
$\Delta H=-67,710-\frac{1}{2} \times 2 \times 290$
$=-68000\, cal$