The enthalpy of vaporisation of liquid diethyl ether is 26.0kJmol−1 at its boiling point 35.0oC.
Calculate △S for conversion of vapour to liquid at 35.0oC in JK−1mol−1.
A
−84.41
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B
+84.41
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C
−48.41
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D
+48.41
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Solution
The correct option is A−84.41 We know that, for conversion of vapour to liquid (condensation): △Scond.=△Hcond.T △Hcond.=−△Hvap.
putting the values, =−26×103308 ∵Hcond=−26kJ △Scond.=−84.41JK−1mol−1