1.

For a given reaction`DeltaH=35.5kJmol^(-1)`and`DeltaS=83.6JK^(-1)mol^(-1)`.The reaction is spontaneous at :(Assume that `DeltaH`and`DeltaS` do no vary with temperature)A. `Tgt425K`B. All temperaturesC. `Tgt298K`D. `T lt 425K`

Answer» Correct Answer - D
`DeltaG=DeltaH-TDeltaS`
For equilibrium `DeltaG=0`
`DeltaH-TDeltaS`
`T_(eq).=(DeltaH)/(DeltaS)=(35.5xx1000)/(83.6)=425K`
Since the reaction is endothemic it will be spontaneous at `Tgt 425K` . Option (1)


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