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

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\ \ 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.
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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)...
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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.

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