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For the reaction between CO(2) and graph...

For the reaction between `CO_(2)` and graphite:
`CO_(2)(g)+C(s)to2CO(g),`
`Delta=170kJ and DeltaS=170.JK^(-1). "The reaction will be spontaneous at": `

A

`298 K`

B

`500K`

C

`900K`

D

`1200K`

Text Solution

Verified by Experts

The correct Answer is:
D
`DeltaH=170,000 J` and `DeltaS=170 JK^(-1)`
When `DeltaG=0 ("equilibrium")`
`TDeltaS=DeltaH`
`T=(DeltaH)/(DeltaS)=(170,000)/(170)=1000 K`
For the reaction to be spontaneous `T` must be ` gt 1000 K`
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