निम्न आंकड़ों की सहायता से `Cl_(aq)^(-)` की संभवन एन्थैल्पी ज्ञात कीजिए।
(i) `(1)/(2)H_(2(g))+(1)/(2)Cl_(2(g))toHCl_((g))`
`Delta_(f)H^(@)=-92.4k.Jmol^(-1)`
`HCl_((g))+aqto H_(aq)^(+)+Cl_(aq)^(-)`
`Delta_(sol)H^(@)=-74.8Kj mol^(-1)`
  `Delta_(f)H^(@)(H_(aq)^(+))=0.00kJ`

Explanation

समीकरण (i) `Delta_(sol)H^(@)=[Delta_(f)H^(@)H_((aq))^(+)]+Delta_(f)H^(@)[Cl_((aq))^(-)]-Delta_(f)H^(@)(HCl_((g)))`
`-74.8kJmol^(-1)=[0.00kjmol+Delta_(f)H^(@)[Cl_((aq))^(-)](-92.4)kJmol^(-1)]`
`-74.8= Delta_(f)H^(@)[Cl_((aq))^(-)]+92.4`
`Delta_(f)H^(@)[CL_((aq))^(-)]=-74.8-92.4=-167.2kJmol^(-1)`