All liquids evaporate to a certain extent. The pressure exerted by the gas phase in equilibrium with the liquid is called vapor

Question

All liquids evaporate to a certain extent. The
pressure exerted by the gas phase in equilibrium
with the liquid is called vapor pressure, Pvap. The
vapor pressure of a particular substance is
determined by the strength of the intermolecular
forces. But for any given substance, the vapor
pressure only changes with temperature. The
Clausius-Clapeyron equation expresses the
relationship between vapor pressure and
temperature:
AHvap
In P₂ = In P₁ + (H) (#)
R
where P2 and P₁ are the vapor pressures that
correspond to temperatures T2 and T₁,
respectively, A Hvap is the molar heat of
vaporization, and R= 8.3145 J/(mol. K) is the
gas constant.
The vapor pressure of dichloromethane, CH₂Cl2, at 0 °C is 134 mmHg. The normal boiling point of dichloromethane is
40. C. Calculate its molar heat of vaporization.
Express your answer to three significant figures and include the appropriate units.

Kunduz · Accepted Answer

Click to see the answer