Matter Part 2 (copy)

what is the molar enthalpy of vaporisation

the heat absorbed when 1 mole of liquid vaporises at the normal boiling point

What is boiling point?

•The temperature at which the vapour pressure of the liquid equals the prevailing atmosphere pressure.

whats variation of vapour pressure described by

clausisus-clapeyron equation

what do we use to calculate vapour pressure at a constant temp

raoults law

if temp is altered what equation do we use

clausius-claperyron

What does the boiling point depend on?

Pressure of the environment

Formulae you should know:

log_p=-(ΔH_vap)/(2.303RT) + constant or ln(p₁/p₂) = -ΔH/R(1/T₁-1/T₂)

Slope = -ΔH_v/2.303R