QJEEM06Che21b: JEE Main 2006 Chemistry - Class 11 JEEM06Che21b Solution: ( ) for the formation of carbon monoxide (CO) from its elements …

Question

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(

\Delta H - \Delta U

) for the formation of carbon monoxide (CO) from its elements at 298 K is : (R = 8.314 J K^–1 mol^–1)

Accepted Answer

For the reaction,

{C_{\left( s \right)}} + {1 \over 2}{O_{2\left( g \right)}} \to CO

\Delta H = \Delta U + \Delta nRT

or

\,\,\,\,\,\Delta H - \Delta U = \Delta nRT

\Delta n = 1 - {1 \over 2} = {1 \over 2};\,\,

\Delta H - \Delta U = {1 \over 2} \times 8.314 \times 298

= 1238.78\,Jmo{l^{ - 1}}

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