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If the enthalpy of formation and enthalp...

If the enthalpy of formation and enthalpy of solution of HCl (g) are-92.3kj /mol and -75.14kJ/mol respectively then find the enthalpy of `Cl^(-)`(aq):

A

`-17.16` kJ/mol

B

`-167.44` kJ/mol

C

17.16 kJ/mol

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
`HCl(g)+aqrarrH^(+)(aq.)+Cl^(-)(aq.),`
`Delta_(r )H=-75.14`
`-75.14 = Delta_(f)H(H^(+),aq)+Delta_(f)H(Cl^(-),g)-Delta_(f)H(HCl, g)`
`because " "Delta_(f)H(H^(+),aq)=0`
`Delta_(f)H(Cl^(-),aq)=-75.14-92.3`
`=-167.44 " kJ"//"mol"`
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