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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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Knowledge Check

  • The enthalpy change for the evaporation of a liquid at its boiling point 127^(@)C is + 40.32 k J mol^(-1) . What is the volume of internal energy change for the above process at 127^(@)C ? (R = 8.3 JK^(-1) mol^(-1))

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    `+43.0 kJ mol^(-1)`
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    `-43.0 kJ mol^(-1)`

  • The enthalpy change for a reaction at equilibrim is -20.5kJ"mol"^(-1) . Then the entropy change for this equilibrim at 410 K is

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