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Calculate Delta H^(@).(f) for chloride i...

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

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