298 K पर `NO` तथा `O_(2)` से `NO_(2)` बनती है।
`NO(g)+(1)/(2)O_(2)(g)hArr NO_(2)(g)`
अभिक्रिया के लिए (क) `DeltaG^(@)` एवं (ख) साम्य स्थिरांक की गणना कीजिए।
`Delta""_(f)G^(@)[NO_(2)]=52.0KJ//"mol"`
`Delta""_(f)G^(@)[NO_(2)]=87.0KJ//"mol"`
`Delta""_(f)G^(@)[NO_(2)]=0 KJ//"mol"`

Explanation

(क) `DeltarG^(@)=sum Delta_(f_(G_("Prducts")^(@)))-sumDelta_(f_(G_(Rectants")^(@)))`
या `Delta rG^(@)=Delta""_(f)G^(@)[NO_(2)]-{Delta""_(f)G^(@)[NO]+(1)/(2)Delta""_(f)G^(@)[O_(2)]}`
या `Delta rG^(@)=52.0-(87.0+0)=-35.5KJ"mol"^(-1)`
(ख) `Delta rG^(@)=-2.303RT"log"_(10)K`
या `log_(10)K=-(DeltarG^(@))/(2.303RT)`
`=-((-35.0))/(2.303xx8.314xx10^(-3)xx298)=6.1341`
`( :. R=8.3141xx10^(-3)KJK^(-1)"mol"^(-1))`
या `K="antilog"_(10)6.1341=1.362xx10^(6)`