# KMT_page4 - • Equation is given as: In P 2 = llHvap (T2...

This preview shows page 1. Sign up to view the full content.

\ \ t,~, t ' Intermolecular Forces and Liauids and Solids CHM 12 Freezing Point Molar Heat of Fusion: energy requires to melt one mole of a solid 3. SOLID - VAPOR EQUILIBRIUM Sublimation: molecules go directly from solid to vapour phase Deposition: vapour -7 solid Molar Heat of Sublimation: heat required to sublime 1 mole of a solid. Summarizes the conditions under which a substance exists as a solid, liquid or gas. c. Boiling Point: temperature at which the equilibrium vapour pressure of a liquid is equal to the external pressure. The normal boiling point is the temperature at which a liquid boils when the external pressure is 1 atm. Inc in heat of vaporization -- inc boiling point d. Critical temperature: highest temperature at which a substance can exist as a liquid. e. Critical Pressure: minimum pressure that must be applied to bring about liquefaction at criticel temperature. Inc Critical temperature -- Inc IMF f. Clausius - Clapeyron Equation Use to calculate the vapour pressure of liquid at different temperature.
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: • Equation is given as: In P 2 = llHvap (T2 -T i ). Pi R TiT2 R = 8.31 J/mol-K PHASE DIAGRAMS 22100 Problems: 1. Diethyl ether is a volatile, highly flammable organic liquid that is used mainly· as a solvent. The vapour pressure of diethyl ether is 401 mmHg at 18 c C. Calculate its vapour pressure at 32 cC. (ilHvap= 26 KJ/mol) 2. The vapour pressure of ethanol is 100 mmHg at 34.9-c. What is ijs vapour pressure at 63.5 =C? (ilHvap for ethanol= 39.3 KJ/mol) 3. The vapour pressure of benzene is 40.1 mmHg at 7.6 vC, What is its vapour pressure at 60.6 cC if ilHvap of benzene is 31 KJ/mol? t 6 e 101.3 I 2. LIQUID-SOLID EQUILIBRIUM • Melting Point: is the temperature at which solid and liquid phases co-exist in equilibrium , t , , , , , , , , , , J( ' Normal Normal,: J~~I~~!!~~~ ~ll:'~P?~nt: ~-_--_ . I , I , .1 UQtlid /: W!pOr 1 \ , , , , , , , , , I , I I I . Solid 374 EEORDONO Page 4 o 0.D1 100 Temperature ('G)...
View Full Document

## This note was uploaded on 10/19/2011 for the course CHEM 12 taught by Professor Ma'amordono during the Summer '11 term at Mapúa Institute of Technology.

Ask a homework question - tutors are online