Question

The Clapeyron equation of any phase transition is:



T

=

∆Hm

T ∆m

where P is pressure, ∆Hm is molar enthalpy change of phase transition, T is absolute

temperature and ∆m is molar volume change of phase transition. By taking

∆m ≈

RT

P

, derive: ln P =

−∆



+ c, where c is a constant. Also discuss the

behaviour of graph between ln P vs

1

T

. What is the slope and intercept of graph?​

Answer 1

where ΔHvap is the Enthalpy (heat) of Vaporization and R is the gas constant (8.3145 J mol-1 K-1).