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K_(a) for CH_(3)COOH at 25^(@)C is 1.754xx10^(-5). At 50^(@)C, K_(a) is 1.633xx10^(-5) what are DeltaH^(0) and DeltaS^(0) for the ionisation of CH_(3)COOH ?

Answer»

SOLUTION :`(DELTAG^(@))_(298)=-2.303RTlogK`
`=-2.303xx8.314xx298xxlog(1.754xx10^(-5))`
`=27194J`
`(DeltaG^(@))_(298)=-2.303xx8.314xx323xxlog(1.633xx10^(-5))`
`=29605J`
`DeltaG^(@)=DeltaH^(@)-TDeltaS^(@)`
`29605=DeltaH^(@)-323DeltaS^(@)`
`:.DeltaH^(@)=-1.55kJ//mol`
`DeltaS^(@)=-96.44J//molK`


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