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The enthalpy change for the transition o...

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

Text Solution

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`Delta_("vap")S=(Delta_("vap")H)/(T_(b))`
Now, `Delta_("vap")H=40.8 kJ//mol = 40800 J//mol`
`Delta_("vap")S=(40800)/(373)` or, `Delta_("vap")S=109.4 JK^(-1)mol^(-1)`
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