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Oxidising power of chlorine in aqueous s...

Oxidising power of chlorine in aqueous solution can be determined by the parameters indicated below
`(1)/(2)CL_(2)(g)overset((1)/(2)Delta_(diss)H^(Theta))(rarr)Cl(g)overset(DeltaH_(Eg)^(Theta))(rarr)`
`Cl^(-)(g)overset(Delta_(hyd)H^(Theta))(rarr)Cl^(-)(aq)`
The energy involved in the conversion of `(1)/(2)Cl_(2)(g)` to
`Cl^(-)(aq)`
(Using the data `Delta_(diss)H_(Cl_(2))^(Theta)=240KJ mol^(-1)`)
`Delta_(Eg)H_(Cl)^(Theta)=-349KJmol^(-1)` ,
`Delta_(Eg)H_(Cl)^(Theta)=-381KJmol^(-1)`) will be

A

`- 610 kJ mol^(-1)`

B

`+ 150 kJ mol^(-1)`

C

`+ 120 kJ mol^(-1)`

D

`- 850 kJ mol^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
A
`{:((1)/(2)Cl_(2)(g)rarrCl(g)," "(1)/(2)Delta_("diss")H^(@)=120 kJ mol^(-1)),(Cl(g)rarrCl^(-)(g)," "Delta_("eg")H^(@)=-349 kJ mol^(-1)),(Cl^(-)(g)rarrCl^(-)(aq.)," "Delta_("hyd")H^(@)=-381 kJ mol),(bar((1)/(2)Cl_(2)(g)rarrCl^(-)(aq.)," "Delta_(r )H^(@)=(1)/(2)Delta_("diss")H+Delta eq H^(@)+Delta_("hyd")H^(@))):}`
`= (120)+(-349)+(-381)`
`=120 - 730`
`= -610 kJ mol^(-1)`
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