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From the following DeltaH^(@) and DeltaS...

From the following `DeltaH^(@)` and `DeltaS^(@)` values, predict which of reactions I, II and III would be spontaneous at `25^(@)C`.
`{:(,DeltaH^(@)(kJ),,DeltaS^(@)(J//K),),(I.,+10.5,,+30,),(II.,+1.8,,-113,),(III.,-126,,+84,):}`

A

III

B

I

C

II and III

D

I and II

Text Solution

Verified by Experts

The correct Answer is:
A
`DeltaG=DeltaH-TDeltaS`
`DeltaG_(I)=10.5 xx 1000 -298xx30=1560`
`DeltaG_(II)=1.8 xx 1000 + 298xx113=35474`
`DeltaG_(IV)=-126xx1000-298xx84=-ve`
III is spontaneous
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