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A substance has normal boiling point pf ...

A substance has normal boiling point pf 400 K. if `DeltaS_(vap)` at 1 atm and `400 K` is `100 J//k "mole",` then calculte `|DeltaS|_("surrounding")` at 1 atm and 200 K for the vaporization process.
Cp of substance in liquide phase =50 J/mol K
Cp of substance in vapour phase = 40 J/mol K
[Express answer in J/k mole]

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