1.

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

Answer»

10
`- 6.0`
`- 12.0`
`- 14.0`

Solution :`DeltaH_("REACTION")=DeltaH_(f)^(@)(N_(2)O_(4))-2DeltaH_(f)^(@)(NO_(2))`
`=2-2(8)=-14 kcal`.


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