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(1)/(2) H(2(g)) + (1)/(2) Cl(2(g)) rarr ...

`(1)/(2) H_(2(g)) + (1)/(2) Cl_(2(g)) rarr HCl_((g)) , Delta H^(0) = - 92.4` kJ/mole, `HCl_((g)) + nH_(2)O rarr H_((aq))^(+) + Cl_((aq))^(-) , Delta H^(0) = -74.8` kJ/mole `Delta H^(0)f` for `Cl_((aq))^(-)` is

A

`-17.6` kJ/mole

B

`-167.2` kJ/mole

C

`+17.6` kJ/mole

D

`-35.2` kJ/mole

Text Solution

Verified by Experts

The correct Answer is:
B
`HCl_((g)) + H_(2)O rarr H_((aq))^(+) + Cl_((aq))^(-)`
`Delta H = Delta H_(f_(Cl^(-))) - Delta H_(f_(HCl))`
`-74.8 = Delta H_(f_(HCl)) - (-92.4) rArr Delta H_(f_(HCl)) = -167.2`
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