Question

S ale WILI LICUA YAHUICHI C I CILITIL SUWLC). TIW SULULI 15 TUU Home of vaporisation is approximately 85 K mol' for non-polar liquids" obeyed? Discuss! Questions 1. The vapour pressure of solid carbon dioxide is given by: inlp/pº)=-(3118.5) + 16.003 And that of liquid carbon dioxide as: Inſp/pº)=-(2,044.9) +11.050 At what temperature do solid and liquid carbon dioxide co-exist hint: to co-exist, the vapour pressure of the solid - the vapour pressure of the liquid], and what is the pressure at this (triple) point? 2. (a) Equation 2.1 can be re-written in a non-logarithmic form as: Ps= pexplas, / Respf-(04.12 where p is the vapour pressure at a temperature, 71. Show that it follows therefore that: 22-nopl-191.07 )

Answer 1

C A sharp melting poll ou 1). When vapour fressure of two phases are equal, we can say both phases exist is ea'm coexist. ln (P/po) = -( 31 18.5) + 16.003 -1073,6 = – 4.953 T &T=216.75k7 | At this temp. both phase exist in equilibrium Putting Tento o +16.63 en (p/po) = -(2044.9) +11.050 .3118.5 216-75 Iatm ) I [P = 5:17 atm For coexist; O = -31 185) +16.003=-(2044.9) Hlins Thus, at triple point pressure is 5.17 atm