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JEE Main levelSingle correct optionDifficulty 2 of 3td046

A liquid obeys Trouton's rule ( $Δ_{v a p} S \approx 88 J mo l^{- 1} K^{- 1}$ ) and boils normally at $350 K$ . Its enthalpy of vaporisation is about

A $3.08 kJ mo l^{- 1}$
B $30.8 kJ mo l^{- 1}$
C $308 kJ mo l^{- 1}$
D $3.98 kJ mo l^{- 1}$

Answer: B

At the normal boiling point

Δ_{v a p} H = T_{b} Δ_{v a p} S = 350 \times 88 = 30800 J mo l^{- 1} = 30.8 kJ mo l^{- 1}

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