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Calculate DeltaH(f)^(@) for chloride ion...

Calculate `DeltaH_(f)^(@)` for chloride ion from the following data `:`
`(1)/(2)H_(2(g))+(1)/(2)Cl_(2(g))rarr HCl_((g)),DeltaH_(f)^(@)=-92.4kJ`
`HCl_((g))+nH_(2)O rarr H_((aq.))^(+)+Cl_((aq.))^(-),DeltaH^(@)=-74.8kJ`
`DeltaH_(f)^(@) H_((aq.))^(+)=0.0kJ`

Text Solution

Verified by Experts

The correct Answer is:
`00167.20`
`00167.20`
Given,
`1/2H_(2)(g)+("Aq")toH^(+)("aq"), /_\H^(@)=0………` (i)
`1/2H_(2)(g)+1/2Cl_(2)(g)to HCl(g) /_\H^(@)=-92.4kJ`…….(ii)
`HCl(g)+H_(2)O(l)toH_(3)O^(+)("aq")+Cl^(-)("aq"), /_\H=-74.8kJ`………….(iii)
BY inspection method: Eqs. `ii+ii-i` reveals that
`1/2 Cl_(2)(g)+("Aq")toCl^(-)("aq"), /_\H=-167.2kJ`
i.e. Heat of formation of `Cl^(-)("aq")=-167.2kJ`
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