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

`-6.0`

`-12.0`

`-14.0`

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The correct Answer is:

Heat of dimerisation
`2 NO_2 hArr N_2O_4`
`therefore Delta H^@ = Sigma Delta_f H_((P))^(@) - Sigma Delta_f H_(( R))^(@)`
`=2-2 xx 8 =-14 kcal.`

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