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For the gas phase reaction PCl(5)rarrP...

For the gas phase reaction
`PCl_(5)rarrPCl_(3)(g)+Cl_(2)(g)`
which of the following conditions are correct?

A

`DeltaH=0` and `DeltaSlt 0`

B

`DeltaHgt0` and `DeltaSgt 0`

C

`DeltaHlt 0` and `DeltaSlt 0`

D

`DeltaHgt 0` and `DeltaSlt 0`

Text Solution

Verified by Experts

The correct Answer is:
D
`DeltaH=DeltaE+ngRT`
For the reaction,
`Deltan=2-1=1`
Thus, the value of `DeltaH` is positive or `gt 0` .
`DeltaG=DeltaH-TDeltaS`
For a spontaneous reaction, `DeltaG` must be negative. Since in this reaction `DeltaH` is positive, so for the negative value o0f `DeltaG , DeltaS` must be positive or `gt 0` .
Hence `DeltaHgt 0 , DeltaSgt 0`
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