CHM 2046C Module 7II Chapter 13 Sample Test

Part U: Clausius-Clapeyron Equation Calculation 5 points

The Clausius-Clapeyron Equation (13.2-page 612) is:

Ln P₂/P₁ = ΔH^o_vap/R [1/T₁ - 1/T₂ ] or

Ln P₂/P₁ = ΔH^o_vap/R [(T₂ - T₁ )/ T₁ T₂]

Calculate the enthalpy of vaporization of diethyl ether, (C₂H₅)₂O. From Figure 13.18 on page 610 Diethyl ether has vapor pressures of 57.0 torre and 534 torre at -22.8^oC and 25.4^oC respectively.