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The enthalpy change for the transition o...

The enthalpy change for the transition of liquid water to steam is 40.8 kJ `mol^(-1)` at 373 K. What is the entropy of vaporisation of water ?

A

`209.4`

B

`109.4`

C

`-109.4`

D

` -209.4`

Text Solution

Verified by Experts

The correct Answer is:
C
`Delta _(vap) S ^(cancel(O)) = ( Delta _(vap) ^( cancel(O)))/( T)`
`Delta _(vap ) S ^(cancel(O)) = ( 40.8 xx 10 ^(3))/( 373) = 109 .4 JK ^(-1) mol ^(-1)`
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