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The enthalpy change states for the follo...

The enthalpy change states for the following processes are listed below :
Given that the standard states for iodine and chlorine are ` I _(2) (s) and C I _(2) (g)` , the standard enthalpy of formation for ` I C I (g) ` is:

A

`-16.8 KJ mol^(-1)`

B

`+16.8 KJ mol^(-1)`

C

`+244.8 KJ mol^(-1)`

D

`-14.6 KJ mol^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
`(1)/(2) I_(2)(s) + (1)/(2) CI_(2)(g) rarr ICI(g)`
`DeltaH_(f,ICI) (g) = [(1)/(2)DeltaH_(I_(2))(s) rarr I_(2)(g) + (1)/(2)DeltaH_(I-I) + (1)/(2)Delta_(CI-CI)] - [DeltaH_(I-CI)]`
`=[(1)/(2)xx 62.76 + (1)/(2)151.0 + (1)/(2)xx 242.3] -[211.3]=16.73 KJ//mol`
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