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The values of DeltaH and DeltaS for the ...

The values of `DeltaH` and `DeltaS` for the reaction
`C("graphite")+CO_(2)(g)to2CO(g)` are `170 kJ` and `170 JK^(-1)` respectively. The reaction will be spontaneous at

A

`990 K`

B

`1140 K`

C

`1100 K`

D

`1110 K`

Text Solution

Verified by Experts

The correct Answer is:
A
`DeltaG=DeltaH-TDeltaS`
`DeltaH=170xx1000=170000J`
`:. DeltaG=DeltaH-TDeltaS`
For equilibrium
`DeltaG=0`
`:. 0=170000J-Txx170 J`
or `T=(170000)/(170)=1000K`
`T` should be less than `1000 K` for spontaneity.
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