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

Calcualte `DeltaH_(f)^(@)` for chloride ion from the following data:
`1/2 H_(2)(g) + 1/2Cl_(2)(g) to HCl (g), Delta H_(f)^(@)=-92.4` kJ
`HCl(g) + nH_(2)O to H^(+)(aq) + Cl^(-) (aq), DeltaH_(f)^(@)` of `H^(+)` (aq) = 0.0 kJ

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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