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  4. A mixture of two moles of carbon monoxide and one mole of oxygen, in a closed vessel is ignited to convert the carbon monoxide to carbon dioxide.If Δ H is the enthalpy change and Δ E is the change in internal energy, then,

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Q. A mixture of two moles of carbon monoxide and one mole of oxygen, in a closed vessel is ignited to convert the carbon monoxide to carbon dioxide.If $\Delta H$ is the enthalpy change and $\Delta E$ is the change in internal energy, then,

KCETKCET 2005Thermodynamics

Solution:

$2 CO + O _{2} \longrightarrow 2 CO _{2}$

$\Delta H=\Delta E+\Delta n R T$

$\Delta \,n=$ No. of moles of gaseous product - No. of moles of gaseous reactant

$\therefore \, \Delta n=2-3=-1 $

$\Delta\, H=\Delta \,E-R T $

$\therefore \, \Delta H<\, \Delta \,E$