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The standard heats of formation of NO(2)...

The standard heats of formation of `NO_(2)(g)` and `N_(2)O_(4)(g)` are 8.0 and 2.0 Kcal `mol^(-1)` respectively the heat of dimerization of `NO_(2)` in Kcal is

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The correct Answer is:
14
`1/2 N_(2) + O_(2) rarr NO_(2) , Delta H = 8 kcal " "…….(i)`
`N_(2) + 2O_(2) rarr N_(2)O_(4) , Delta H = 2 kcal" "…..(ii)`
By euqution (i) `xx 2 - (ii)`
`2NO_(2) rarr N_(2)O_(4) , " "Delta H = - 14. 0 kcal`
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