For the liquid vapour equilibrium of a substance dP / dT at 1 bar and 400 K is 8 10-3 bar K-1. If the molar volume in the vapour form is 200 Lmol-1 and the molar volume in the liquid form is negligible, the molar enthalpy of vapourisation is (1.0 bar L=100 J)

ABC26PH1451 · Thermodynamics

Subject: Physical Chemistry · Chapter: Thermodynamics · Topic: Laws State Functions · Exam: NET DEC 2011 · Marks: 2 · Difficulty: Medium

For the liquid $\rightleftharpoons$ vapour equilibrium of a substance $\mathrm{dP} / \mathrm{dT}$ at 1 bar and 400 K is $8 \times 10^{-3} \mathrm{bar} \mathrm{K}^{-1}$. If the molar volume in the vapour form is $200 \mathrm{Lmol}^{-1}$ and the molar volume in the liquid form is negligible, the molar enthalpy of vapourisation is (1.0 bar $\mathrm{L}=100 \mathrm{J}$)

(a)$640 \mathrm{kJ} \mathrm{mol}^{-1}$

(b)$100 \mathrm{kJ} \mathrm{mol}^{-1}$

(c)$80 \mathrm{kJ} \mathrm{mol}^{-1}$

(d)64 kJ mol

Answer

Answer (as printed): D

Explanation

No explanation was printed for this question.

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