Question #b39e8
1 Answer
By Clausius - Clapeyron equation weknow
#color(red)(ln(P_1/P_2) = (DeltaH_"vap")/R xx (1/T_2 - 1/T_1)#
Where
#P_1# is the vapor pressure of the liquid at#T_1K#
#P_2# is the vapor pressure of the liquid at#T_2K#
#R# is the universal gas constant, equal to#"8.314J mol"^(-1)"K"^(-1)#
#DeltaH_"vap"= "enthalpy of vaporization of the liquid"#
Given
Inserting these in above equation
#color(blue)(ln(P_1/P_2) = (DeltaH_"vap")/R xx (1/T_2 - 1/T_1)#
#=>color(blue)(ln(8.54/P_2) = (41.8xx10^3)/8.314xx (1/393 - 1/278)#
#=>color(blue)(ln(8.54)-lnP_2 = (41.8xx10^3)/8.314xx (1/393 - 1/278))#
#=>color(blue)(lnP_2 =ln(8.54)- (41.8xx10^3)/8.314xx (1/393 - 1/278))#
#=>color(blue)(lnP_2=7.437)#
#=>color(blue)(P_2=e^7.437~~1698mm)#